Patent Publication Number: US-2021181096-A1

Title: System and method of determining issues with optical components

Description:
BACKGROUND 
     Field of the Disclosure 
     This disclosure relates to determining if an optical unit should be replaced or repaired and more particularly to utilizing intensities of reflected light from a test surface to determine if an optical unit should be replaced or repaired. 
     Description of the Related Art 
     In the past, it was not been possible to determine the quality of complex optical units, such as F-theta lenses, without special and expensive measuring instruments. These special measuring instruments were usually available from producers of the complex optical units. An example of a special measuring instrument that can determine the quality of complex optical units is a wavefront sensor. For example, the wavefront sensor may be specifically designed for the parameters of a complex optical unit. The special measuring instrument may provide detailed information that may not be necessary to determine if a complex optical unit should be replaced during final device assembling or field service action. Without needing such unnecessary information, other one or more systems, one or more processes, and/or one or more methods may be implemented to determine if a complex optical unit should be replaced. 
     SUMMARY 
     The present disclosure provides a system that may provide multiple first portions of a laser beam to an objective lens of an optical system; may provide the multiple first portions of the laser beam to respective multiple locations of a test surface; may receive multiple second portions of the laser beam from the test surface; provide the multiple second portions of the laser beam to a two-photon absorption (TPA) detector; may determine multiple intensities respectively associated with the multiple second portions of the laser beam; may transform the multiple intensities into data that represents multiple measurement values of the multiple intensities; may determine, from the data, if an intensity value of the multiple intensities is below a threshold intensity value; if the intensity value of the multiple intensities is not below the threshold intensity value, may provide information that indicates there is no issue associated with the objective lens; and if the intensity value of the multiple intensities is below the threshold intensity value, may provide information that indicates an issue associated with the objective lens. For example, the issue associated with the objective lens may be an optical aberration. 
     The system may include a laser that generates the laser beam. The system may include a biometry device that may include the optical system. The optical system may include at least one mirror. For example, the system may further adjust the at least one mirror to provide the multiple first portions of the laser beam to the respective multiple locations of the test surface. The system may include multiple lenses, different from the objective lens. For example, the system may further adjust the multiple lenses to expand respective diameters of the multiple first portions of the laser beam. The system may include a diaphragm. For example, the system may further adjust a diameter of an aperture of the diaphragm. The diaphragm may permit light, reflected from the test surface, to pass through the aperture and may block the light, reflected from the test surface, outside the aperture. For example, the test surface may be partially reflective. 
     The present disclosure further includes a non-transient computer-readable memory device with instructions that, when executed by a processor of a system, cause the system to perform the above steps. The present disclosure further includes a system or a non-transient computer-readable memory device as described above with one or more of the following features, which may be used in combination with one another unless clearly mutually exclusive: i) provide multiple first portions of a laser beam to the objective lens of the optical system; ii) provide, via the objective lens, the multiple first portions of the laser beam to respective multiple locations of a test surface; iii) receive, via the objective lens, multiple second portions of the laser beam from the test surface; iv) provide the multiple second portions of the laser beam to the TPA detector; v) determine multiple intensities respectively associated with the multiple second portions of the laser beam; vi) transform the multiple intensities into data that represents multiple of measurement values of the multiple intensities; vii) determine, from the data, if an intensity value of the multiple intensities is below a threshold intensity value; viii) if the intensity value of the multiple intensities is below the threshold intensity value, provide information that indicates an issue associated with the objective lens; ix) if the intensity value of the multiple intensities is not below the threshold intensity value, provide information that indicates there is no issue associated with the objective lens; x) generate the laser beam; xi) adjust the at least one mirror to provide the multiple first portions of the laser beam to the respective multiple locations of the test surface; and xii) adjust a diameter of an aperture of a diaphragm. 
     Any of the above systems may be able to perform any of the above methods and any of the above non-transient computer-readable memory devices may be able to cause a system to perform any of the above methods. Any of the above methods may be implemented on any of the above systems or using any of the above non-transient computer-readable memory devices. 
     It is to be understood that both the foregoing general description and the following detailed description are examples and explanatory in nature and are intended to provide an understanding of the present disclosure without limiting the scope of the present disclosure. In that regard, additional aspects, features, and advantages of the present disclosure will be apparent to one skilled in the art from the following detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a more complete understanding of the present disclosure and its features and advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, which are not drawn to scale, and in which: 
         FIG. 1A  illustrates an example of an optical system; 
         FIG. 1B  illustrates another example of an optical system; 
         FIG. 2A  illustrates an example of a medical system; 
         FIG. 2B  illustrates an example of a biometry device; 
         FIG. 3A  illustrates a second example of a medical system; 
         FIG. 3B  illustrates a third example of a medical system; 
         FIG. 3C  illustrates an example of a microscope integrated display and examples of surgical tooling equipment; 
         FIG. 3D  illustrates another example of a medical system; 
         FIG. 4  illustrates an example of a computer system; 
         FIG. 5  illustrates an example of a method of operating an optical system; 
         FIG. 6  illustrates an example of a method of determining if an objective lens is associated with an issue; 
         FIG. 7A  illustrates an example of a test surface and multiple locations; 
         FIG. 7B  illustrates an example of an objective lens providing portions of a laser beam to a test surface; 
         FIG. 7C  illustrates an example of an objective lens receiving portions of a laser beam reflected off a test surface; 
         FIG. 7D  illustrates another example of an objective lens providing portions of a laser beam to a test surface; 
         FIG. 7E  illustrates a second example of an objective lens receiving portions of a laser beam reflected off a test surface; 
         FIG. 7F  illustrates an example of a diaphragm and an objective lens providing portions of a laser beam to a test surface; 
         FIG. 7G  illustrates an example of a diaphragm and an objective lens receiving portions of a laser beam reflected off a test surface; 
         FIG. 7H  illustrates another example of a diaphragm and an objective lens providing portions of a laser beam to a test surface; 
         FIG. 7I  illustrates an example of an objective lens receiving portions of a laser beam reflected off a test surface and a diaphragm blocking portions of the laser beam; 
         FIG. 7J  illustrates an example of one or more aberrations of an objective lens causing a focus of the objective lens to be beyond a test surface; 
         FIG. 7K  illustrates an example of reflected portions of a laser beam not returning along incident paths of the laser beam; 
         FIG. 7L  illustrates an example of one or more aberrations of an objective lens causing a focus of the objective lens to be short of a test surface; and 
         FIG. 7M  illustrates another example of reflected portions of a laser beam not returning along incident paths of the laser beam. 
     
    
    
     DETAILED DESCRIPTION 
     In the following description, details are set forth by way of example to facilitate discussion of the disclosed subject matter. It should be apparent to a person of ordinary skill in the field, however, that the disclosed embodiments are examples and not exhaustive of all possible embodiments. 
     As used herein, a reference numeral refers to a class or type of entity, and any letter following such reference numeral refers to a specific instance of a particular entity of that class or type. Thus, for example, a hypothetical entity referenced by ‘12A’ may refer to a particular instance of a particular class/type, and the reference ‘12’ may refer to a collection of instances belonging to that particular class/type or any one instance of that class/type in general. 
     Medical systems may be utilized in performing medical procedures with patients. Medical systems may include optics. For example, a medical system may include one or more optical systems that may include optics. An optical system may include one or more optical devices. For example, an optical device may be or may include a device that controls light (e.g., reflects light, refracts light, filters light, transmits light, polarizes light, etc.). An optical device may be made of any material that controls the light as designed. For example, the material may include one or more of glass, crystal, metal, and semiconductor, among others. Examples of optical devices may include one or more of lenses, mirrors, prisms, optical filters, waveguides, waveplates, beam expanders, beam collimators, beam splitters, gratings, and polarizers, among others. While an optical system may be designed for consistency, the optical system may be tested. For example, the optical system may be periodically tested to determine if the optical system is functioning according to one or more parameters. 
     An optical system may be tested utilizing a surface. For example, the surface may include only a few aberrations. The surface may be configured to emulate an ideal surface. In one example, the aberrations of the surface may not produce false-positives when utilized in testing an optical system. In another example, the aberrations of the surface may produce a number of false-positives, when utilized in testing an optical system, that are within a tolerance. 
     An optical system may include a two-photon absorption detector. For example, one or more processes and/or one or more methods utilized in testing the optical system may take advantage of one or more effects of two-photon absorption. During testing, an offset value may be set during focus control to characterize a quality of the optical system by way of deviations from an expected location of an offset depth in reflections from a surface. The reflections may be analyzed to determine if the optical system has any locally definable deficiencies. 
     One or more characterization of complex optical devices, such as a F-theta objective lens, may be possible utilizing one or more systems, one or more processes, and/or one or more methods described herein. For example, one or more characterization of complex optical devices, such as a F-theta objective lens, may be possible without utilizing special and/or expensive measuring instruments such as wavefront sensors, which may be specifically designed for specific parameters of the optical devices. 
     Turning now to  FIG. 1A , an example of an optical system is illustrated. An optical system  110  may calibrate a position of a focal point of a laser beam directed to a target. For example, the target may be a surface  112 . Surface  112  may be referred to as a reference surface. Surface  112  may be referred to as a test surface. Surface  112  may be utilized in determining if one or more portions of optical system  110  may be utilized in one or more procedures. Surface  112  may be utilized in determining if one or more portions of optical system  110  may be utilized in one or more medical procedures. For example, if the one or more portions of optical system  110  may not be utilized in the one or more medical procedures, the one or more portions of optical system  110  may be repaired or may be replaced. Surface  112  may be a surface of a test material that mimics a portion of a patient. Surface  112  may be a surface of a test material to calibrate optical system  110 . Surface  112  may be a surface of a test material that mimics a portion of a patient. In one example, surface  112  may be completely reflective. In another example, surface  112  may be partially reflective. As an example, the test material may include polymethyl methacrylate (PMMA). PMMA may mimic an eye of a patient. For example, PMMA may mimic one or more reflections of light off an eye of a patient. 
     Optical system  110  may be utilized in a medical procedure. For example, the medical system may include optical system  110 . The medical procedure may include an ophthalmic procedure on at least a portion part of an eye of a patient. Although optical system  110  may be utilized in a medical system, optical system  110  may be utilized in any system. As an example, optical system  110  may be utilized with a telescope. The telescope may be a reflecting telescope. 
     Optical system  110  may include multiple optical devices. For example, an optical device may be or may include a device that controls light (e.g., reflects light, refracts light, filters light, transmits light, polarizes light, etc.). An optical device may be made of any material that controls the light as designed. For example, the material may include one or more of glass, crystal, metal, and semiconductor, among others. Examples of optical devices may include one or more of lenses, mirrors, prisms, optical filters, waveguides, waveplates, beam expanders, beam collimators, beam splitters, gratings, and polarizers, among others. 
     As shown, optical system  110  may include a laser  120 . Laser  120  may generate a laser beam. In one example, the laser beam may be a pulsed laser beam. In another example, the laser beam may be a continuous wave laser beam. Laser  120  may be a device that generates a beam of coherent monochromatic light by stimulated emission of photons from excited atoms or molecules. A laser beam may have any suitable wavelength, e.g., a wavelength in the infrared (IR), in the visible, or ultraviolet (UV) range, among others. Pulses of the laser beam may have a pulse duration in any suitable range, e.g., the microsecond, nanosecond, picosecond, femtosecond, or attosecond range, among others. The focus of the laser beam may be a focal point of the laser beam. As illustrated, optical system may include detector optics  122  and focusing optics  140 . As shown, detector optics  122  may include a polarizer  124 , a lens  128 , a two-photon absorption (TPA) detector  130 , and a waveplate  134 . Although lens  128  is shown as a single lens, lens  128  may be multiple lenses. 
     Polarizer  124  may be an optical filter that transmits light of a specific polarization direction while reflecting light of other polarization directions. Polarizer  124  may filter light of undefined or mixed polarization into light with a single linear polarization. In one example, polarizer  124  may transmit at least a portion of the laser beam received from laser  120  (which may have a first polarization) towards waveplate  134 . In another example, polarizer  124  may reflect at least portion of the laser beam received from waveplate  134  (which may have a second polarization) towards lens  128  and TPA detector  130 . The first polarization may be a linear polarization. The second polarization may be the linear polarization rotated by ninety degrees (90°). Lens  128  may focus the beam from polarizer  124  to TPA detector  130 . For example, TPA detector  130  may be located at a focal plane of lens  128 . Lens  128  may be an achromatic lens. For example, lens  128  may be configured to limit effects of one or more chromatic aberrations and/or one or more spherical aberrations, among others. 
     Waveplate  134  may be an optical device that alters a polarization of light travelling through it. Waveplate  134  may be any suitable waveplate, e.g., a quarter-waveplate, which may convert linearly polarized light into circularly polarized light and vice versa, or a combination of a half-waveplate (which may rotate linearly polarized light by forty-five degrees (45°)) and a forty-five degree (45°) Faraday rotator (also known as an optical diode when used in combination with polarizer  124 ). Waveplate  134  may be a quarter-waveplate that may receive the laser beam with a first linear polarization from polarizer  124 . Waveplate  134  may convert the laser beam from the first linear polarization to a circular polarization. Waveplate  134  may direct the laser beam to focusing optics  140 . Waveplate  134  may receive at least a reflected portion of the laser beam from focusing optics  140 . Waveplate  134  may convert the at least the reflected portion of the laser beam from focusing optics  140  from a circular polarization to a second linear polarization rotated relative to a first linear polarization. Waveplate  134  may change the original linear polarization of the laser beam by ninety degrees (90°). 
     Waveplate  134  may include a combination of a half-waveplate and a Faraday rotator. Waveplate  134  may receive the laser beam with a first linear polarization from polarizer  124 . In this direction, the half-waveplate and the Faraday rotator may compensate for each other&#39;s rotational effect, which may result in a rotation of the laser beam by zero degrees (0°). Waveplate  134  may then direct the laser beam to focusing optics  140 . Waveplate  134  may also receive the at least the reflected portion of the laser beam reflected from focusing optics  140 . In this direction, the half-waveplate and the Faraday rotator may add rotational effects, which may result in a rotation of the laser beam by ninety degrees (90°), which may be a second linear polarization rotated relative to the first linear polarization. For example, the laser beam may pass through waveplate  134 , which may rotate the beam by zero degrees (0°), and may be reflected back through waveplate  134 , which may rotate the beam by ninety degrees (90°), resulting in a change from the original linear polarization of the laser beam by ninety degrees (90°). Waveplate  134  may be reconfigured such that the laser beam may pass through waveplate  134 , which may rotate the beam by ninety degrees (90°), and may be reflected back through waveplate  134 , which may rotate the beam by zero degrees (0°). 
     Although not specifically illustrated, optical system  110  may not include waveplate  134 . For example, polarizer  124  may be replaced with a partially reflecting mirror. Although not specifically illustrated, detector optics  122  may be positioned between beam expander  141  and scanner  144 . 
     As illustrated, focusing optics  140  may include a beam expander  141 , a scanner  144 , and an objective lens  148 . Objective lens  148  may include multiple lenses. In one example, objective lens  148  may be or include a compound lens. In another example, objective lens  148  may be or include a F-theta lens. As shown, beam expander  141  may include lenses  142 A and  142 B. Although beam expander  141  is shown with two lenses, beam expander  141  may include any number of lenses. 
     A direction of the laser beam, as the laser beam approaches surface  112 , may be parallel to a Z-axis. Surface  112  may be parallel to a X-axis and perpendicular to the Z-axis. Although a Y-axis is not specifically illustrated, the Y-axis may be perpendicular to the X-axis and the Z-axis. For example, the Y-axis may be perpendicular to a plane that includes the X-axis and the Z-axis. A direction of the laser beam, as the laser beam approaches surface  112 , may not be parallel to the Z-axis. For example, an issue associated with objective lens  148  may cause the direction of the laser beam, as the laser beam approaches surface  112 , to not be parallel to the Z-axis. 
     Focusing optics  140  may direct and/or may focus the laser beam towards surface  112 . Focusing optics  140  may direct a focal point of the laser beam along the Z-axis towards surface  112  and may receive at least a portion of the beam reflected by surface  112 . An optical device, such as a lens  142 A and/or a mirror, may control a Z-position of a focal point of a laser beam. Another optical device, such as a lens  142 B (e.g., in combination with lens  142 A), may expand a diameter of a laser beam. In one example, beam expander  141  may be configured to consistently control a focal point of a laser beam. In another example, optics may vary over time such that the Z-position of the focal point changes. One or more calibrations of the Z-position of the focal point of the laser beam may be measured from time to time. 
     Scanner  144  may include one or more optical devices that may control a direction of a laser beam to control the XY-position of the focal point. To transversely deflect the laser beam, scanner  144  may include a pair of galvanometric actuated scanner mirrors that may tilt about mutually perpendicular axes. Scanner  144  may receive the laser beam from beam expander  141 . Scanner  144  may manipulate the laser beam to control the XY-position of the focal point. Objective lens  148  may receive the laser beam from the scanner  144 . Objective lens  148  may direct the beam to surface  112 . 
     An interface  114  may stabilize a position of surface  112  relative to optical system  110 . For example, interface  114  may be made of one or more rigid materials (e.g., plastic, glass, metal, etc.). Interface  114  may be a patient interface  114 . For example, a patient interface  114  may shape an eye (e.g., flatten or otherwise deform) a surface of the eye. A “target-side” surface of patient interface  114  may be the surface of interface  114  designed to face (and may even be in contact with) an eye. A patient interface  114  may be a one-time-use product. For example, a patient interface  114  may be utilized with an eye of a patient and then discarded. Multiple patient interfaces  114  may be configured with a consistent length in a Z-direction. Multiple patient interfaces  114  may have different respective lengths. A calibration of a Z-position of a point with respect to a particular interface  114  may be performed. 
     As illustrated, optical system  110  may include a computer system  152 . Computer system  152  may execute instructions in implementing at least a portion of one or more systems, one or more flow charts, one or more processes, and/or one or more methods described herein. Although optical system  110  is illustrated as including computer system  152 , optical system  110  may not include computer system  152 . For example, computer system  152  may be external to optical system  110 . Computer system  152  may be communicatively coupled to optical system  110 . 
     Focusing optics  140  may direct a laser beam to surface  112 . For example, surface  112  may be located at an end of an interface  114 . Surface  112  may reflect the laser beam. Surface  112  may reflect at least a portion of the laser beam. Detector optics  122  may direct the at least the portion of the laser beam to TPA detector  130 . For example, TPA detector  130  may transform an intensity of the at least the portion of the laser beam into digital data. The digital data may represent the intensity of the at least the portion of the laser beam. TPA detector  130  may provide the digital data to computer system  152 . 
     The at least the portion of the laser beam may cause two-photon absorption that may excite electrons, which may generate a signal in response to an intensity of incident radiation. The signal may indicate a proximity of a focal point of the laser beam to surface  112 . In one example, the farther away the focal point is from surface  112 , the lower an intensity of the beam at a portion TPA detector  130 . In a second example, the larger a diameter of the at least the portion of the laser beam, the lower an intensity of the beam at a portion TPA detector  130 . In a third example, the closer the focal point is to surface  112 , the higher an intensity of the beam at a portion TPA detector  130 . In a fourth example, the smaller a diameter of the at least the portion of the laser beam, the higher an intensity of the beam at a portion TPA detector  130 . In another example, when the focal point is at surface  112 , a diameter at TPA detector  130  may be at a minimum, and an intensity may be at a maximum. 
     As illustrated, computer system  152  may be communicatively coupled to TPA detector  130 . As shown, computer system  152  may be communicatively coupled to laser  120 . As illustrated, computer system  152  may be communicatively coupled to beam expander  141 . As shown, computer system  152  may be communicatively coupled to scanner  144 . In one example, computer system  152  may receive information from one or more of laser  120 , TPA detector  130 , beam expander  141 , and scanner  144 , among others. In another example, computer system  152  may provide information to one or more of laser  120 , TPA detector  130 , beam expander  141 , and scanner  144 , among others. Computer system  152  may provide control information to one or more of laser  120 , TPA detector  130 , beam expander  141 , and scanner  144 , among others. 
     Computer system  152  may determine if a focal point of a laser beam is calibrated in response to intensity measurements from TPA detector  130 . Computer system  152  may determine if an intensity is a maximum intensity. The maximum intensity may be the maximum of intensities may be measured at different positions of a focal point. The maximum intensity may be measured or calculated prior to a calibration session, so computer system  152  may determine if the intensity measured during the calibration session is at a maximum. If the intensity is the maximum intensity, computer system  152  may determine that the focal point is at surface  112 . If the intensity is not the maximum intensity, computer system  152  may adjust focusing optics  140  to direct a focal point to a different point of the Z-axis. Computer system  152  may generate, from one or more TPA detector signals, a graph that may represent intensities of the at least the portion of the laser beam. For example, the one or more TPA detector signals may be or include data. 
     Turning now to  FIG. 1B , another example of an optical system is illustrated. As shown, optical system  110  may include a diaphragm  160 . As illustrated, diaphragm  160  may include an aperture  162 . As shown, computer system  152  may be communicatively coupled to diaphragm  160 . Computer system  152  may provide control information to diaphragm  160 , among others. For example, computer system  152  may provide, to diaphragm  160 , control information that indicates a diameter of aperture  162 . A diameter of aperture  162  may permit light to travel through diaphragm  160 . For example, diaphragm  160  may prevent light from traveling through one or more areas of diaphragm  160  other than aperture  162 . Although not specifically illustrated, computer system  152  may not be communicatively coupled to diaphragm  160 . In one example, a diameter of aperture  162  may be fixed. In another example, a diameter of aperture  162  may be adjusted by a person. 
     Turning now to  FIG. 2A , an example of a medical system is illustrated. As shown, a medical system  210  may be utilized with a patient  220 . As illustrated, medical system  210  may include a computer system  212 . Computer system  212  may be communicatively coupled to displays  216 A and  216 B. Computer system  212  may be communicatively coupled to a biometry device  214 . In one example, biometry device  214  may include one or more cameras. In another example, biometry device  214  may include a three-dimensional scanner. Biometry device  214  may be utilized in biometry of an eye  222  of patient  220 . As shown, display  216 A may display an image  230 A associated with eye  222  of patient  220 . As illustrated, display  216 B may display an image  230 B associated with eye  222  of patient  220 . 
     Computer system  212  may determine eye recognition information. For example, the eye recognition information may include biometry information associated with eye  222  of patient  220 . The biometry information associated with eye  222  may include one or more of a pattern of blood vessels of a sclera of eye  222 , a structure of an iris of eye  222 , a position of a structure of an iris of eye  222 , a distance measurement of a cornea of eye  222  to a lens of eye  222 , a distance measurement of a lens of eye  222  to a retina of eye  222 , a corneal topography of eye  222 , a retinal pattern of eye  222 , and a wavefront measurement, among others. 
     As shown, display  216 B may display display areas  236 A- 236 D. In one example, a display area  236  may display a distance measurement of a cornea of eye  222  to a lens of eye  222 , a distance measurement of a lens of eye  222  to a retina of eye  222 , a position of a structure of an iris  234 , corneal topography information, or wavefront measurement information, among other biometry information associated with eye  222 . In another example, a display area  236  may display any information associated with patient  220 . 
     A person  250  may operate medical system  210 . For example, person  250  may be medical personnel. Person  250  may enter identification information associated with patient  220  into computer system  212 . The identification information associated with patient  220  may include one or more of a name of patient  220 , an address of patient  220 , a telephone number of patient  220 , a government issued identification number of patient  220 , a government issued identification string of patient  220 , and a date of birth of patient  220 , among others. 
     Person  250  may provide medical procedure information, associated with patient  220 , to computer system  212 . The medical procedure information may be associated with a medical procedure. The medical procedure information may be associated identification information associate with patient  220 . Computer system  212  may store the medical procedure information. For example, computer system  212  may store the medical procedure information for later utilization. The medical procedure information may be associated with a surgery. For example, the medical procedure information may be retrieved before the surgery. The medical procedure information may be utilized during a medical procedure. For example, the medical procedure may include a surgery. 
     Turning now to  FIG. 2B , an example of a biometry device is illustrated. As shown, biometry device  214  may include image sensors  260 A- 260 C. For example, an image sensor  260  may include a camera. A camera may include a one or more digital image sensors. In one example, a digital image sensor may include a charge-coupled device (CCD). In another example, a digital image sensor may include a complementary metal-oxide-semiconductor (CMOS). The camera may transform light into digital data. The camera may utilize a Bayer filter mosaic. For example, the camera may utilize a Bayer filter mosaic in combination with an optical anti-aliasing filter. A combination of the Bayer filter mosaic in combination with the optical anti-aliasing filter may reduce aliasing due to reduced sampling of different primary-color images. The camera may utilize a demosaicing process. For example, the demosaicing process may be utilized to interpolate color information to create a full array of red, green, and blue (RGB) image data. 
     As illustrated, biometry device  214  may include light projectors  262 A- 262 C. In one example, a light projector  262  may project visible light. In another example, a light projector  262  may project infrared light. A light projector  262  may project circles and/or dots onto an eye of a patient. An image sensor  260  may receive reflections of the circles and/or the dots that were projected onto the eye of the patient. A computer system may determine one or more locations and/or one or more templates associated with the eye of the patient based at least on the reflections of the circles and/or the dots that were projected onto the eye of the patient. As shown, biometry device  214  may include depth sensors  264 A- 264 C. A depth sensor  264  may include a light projector  262 . A depth sensor  264  may include an optical sensor. As illustrated, biometry device  214  may include an optical low coherence reflectometer (OLCR) device  266 . As shown, biometry device  214  may include a wavefront device  268 . 
     Wavefront device  268  may include one or more of a light source and a wavefront sensor, among others. A light source may provide a first light wave to eye  222 . A wavefront sensor may receive a first perturbed light wave, based at least on the first light wave, from eye  222 . In one example, wavefront device  268  may determine first optical corrections based at least on the first perturbed light. In another example, a computer system may determine first optical corrections based at least on the first perturbed light. Wavefront device  268  may provide data, based at least on the first perturbed light wave, to a computer system. For example, the computer system may determine first optical corrections based at least on the data from wavefront device  268 . 
     Any two or more of an image sensor  260 , a light projector  262 , a depth sensor  264 , an OLCR device  266 , and a wavefront device  268  may be combined. One or more of image sensors  260 A- 260 C, one or more of light projectors  262 A- 262 C, one or more of depth sensors  264 A- 264 C, OLCR device  266 , and/or wavefront device  268 , among others, may produce data that may be utilized by a computer system. As illustrated, biometry device  214  may include an optical system  110 . 
     Turning now to  FIG. 3A , a second example of a medical system is illustrated. As shown, a surgeon  310  may utilize surgical tooling equipment  320 . In one example, surgeon  310  may utilize surgical tooling equipment  320  in a surgery involving eye  222  of patient  220 . A medical system  300 A may include an ophthalmic surgical tool tracking system. As illustrated, medical system  300 A may include a computer system  330 , a display  340 , and a microscope integrated display (MID)  350 . 
     Computer system  330  may receive image frames captured by one or more image sensors. For example, computer system  330  may perform various image processing on the one or more image frames. Computer system  330  may perform image analysis on the one or more image frames to identify and/or extract one or more images of surgical tooling equipment  320  from the one or more image frames. Computer system  330  may generate a graphical user interface (GUI), which may overlay the one or more image frames. For example, the GUI may include one or more indicators and/or one or more icons, among others. The one or more indicators may include surgical data, such as one or more positions and/or one or more orientations. The one or more indicators may include one or more warnings. The GUI may be displayed by display  340  and/or MID  350  to surgeon  310  and/or other medical personnel. 
     Computer system  330 , display  340 , and MID  350  may be implemented in separate housings communicatively coupled to one another or within a common console or housing. A user interface may be associated with one or more of computer system  330 , display  340 , and MID  350 , among others. For example, a user interface may include one or more of a keyboard, a mouse, a joystick, a touchscreen, an eye tracking device, a speech recognition device, a gesture control module, dials, and/or buttons, among other input devices. A user (e.g., surgeon  310  and/or other medical personnel) may enter desired instructions and/or parameters via the user interface. For example, the user interface may be utilized in controlling one or more of computer system  330 , display  340 , and MID  350 , among others. As illustrated, MID  350  may include an optical system  110 . 
     Turning now to  FIG. 3B , a third example of a medical system is illustrated. As shown, a surgeon  310  may utilize a system  300 B. For example, surgeon  310  may utilize system  300 B in a surgery involving eye  222  of patient  220 . System  300 B may include multiple systems. As shown, system  300 B may include a cutting system  315 A. For example, surgeon  310  may utilize system  315 A in cutting eye  222 . Eye  222  may include a flap in a cornea of an eye of patient  220 . As illustrated, system  300 B may include a shaping system  315 B. For example, surgeon  310  may utilize shaping system  315 B in performing ablation on an interior part of the cornea of eye  222 . 
     As shown, system  315 A may include a display  340 A. As illustrated, system  315 A may include a MID  350 A. As illustrated, MID  350 A may include eye pieces  352 AA and  352 AB. An eye piece  352 A may refer to an eye piece  352 AA or to an eye piece  352 BA. An eye piece  352 B may refer to an eye piece  352 AB or to an eye piece  352 BB. System  315 A may include one or more of image sensors  260 A- 260 C, one or more of light projectors  262 A- 262 C, one or more of depth sensors  264 A- 264 C, OLCR device  266 , wavefront device  268 , and/or an optical system  110 A, among others. As illustrated, system  315 B may include a display  340 B. As shown, system  315 B may include a MID  350 B. As illustrated, MID  350 B may include eye pieces  352 BA and  352 BB. System  315 B may include one or more of image sensors  260 A- 260 C, one or more of light projectors  262 A- 262 C, one or more of depth sensors  264 A- 264 C, OLCR device  266 , and/or wavefront device  268 , among others. As shown, system  315 B may include an optical system  110 B. 
     System  315 A may include a laser, such as a femtosecond laser, which may use short laser pulses to ablate a series of small portions of corneal tissue to form a flap that may be lifted up to expose an interior part of the cornea. The flap may be planned and cut using one or both of cutting device displays  340 A and  350 A, along with control devices and a computer system  330 A. As shown, system  315 A may include computer system  330 A. For example, computer system  330 A may be communicatively coupled to one or more of image sensors  260 A- 260 C, one or more of light projectors  262 A- 262 C, one or more of depth sensors  264 A- 264 C, OLCR device  266 , wavefront device  268 , and/or optical system  110 A, among others, of system  315 A. As illustrated, system  315 B may include computer system  330 B. For example, computer system  330 B may be communicatively coupled to one or more of image sensors  260 A- 260 C, one or more of light projectors  262 A- 262 C, one or more of depth sensors  264 A- 264 C, OLCR device  266 , wavefront device  268 , and/or optical system  110 B among others, of system  315 B. 
     Systems  315 A and  315 B may be physically separated as shown in  FIG. 3B . Patient  220  may be moved between systems  315 A and  315 B. Alternatively, patient  220  may remain stationary and systems  315 A and  315 B may be moved to patient  220 . Systems  315 A and  315 B may be physically combined into a single unitary device, such that neither the device nor patient  220  is repositioned when switching between systems  315 A and  315 B. 
     System  300 B may include one or more control devices for controlling systems  315 A and  315 B. For example, the one or more control devices may include one or more of an interactive display, such as a touchscreen display, a keyboard, a mouse, a touchpad, buttons, a joystick, a foot pedal, a heads-up display, and virtual-reality glasses, or other devices able to interact with a user, such as medical personnel. 
     System  300 B may include at least one computer system configured to generate an image presented on at least one of displays  340 A,  350 A,  340 B, and  350 B, among others. For example, the at least one computer system may include one or more of computer systems  330 A and  330 B. One or more of computer systems  330 A and  330 B may be communicatively coupled to observational devices, such as a microscope, a camera, an optical coherence tomography (OCT) device or display, or another device able to measure the position of the eye undergoing surgery. One or more of computer systems  330 A and  330 B may be communicatively coupled to one or more of the control devices. 
     In one example, cutting device computer system  330 A: i) may be communicatively coupled to observational devices that observe the eye when patient  220  is positioned with system  315 A, ii) may provide graphical information regarding the planned flap location and the planned area of ablation to one or more of displays  340 A and  350 A, and iii) may be communicatively coupled to one or more control devices of system  315 A. In a second example, shaping device computer  330 B: i) may be communicatively coupled to observational devices that observe the eye when patient  220  is positioned with a shaping device, ii) may provide graphical information regarding the planned flap location and the planned area of ablation to one or more of displays  340 B and  350 B, and iii) may be communicatively coupled to one or more control devices of system  315 B. In another example, a computer system may include the properties and/or the attributes described above with respect to one or more of computer systems  330 A and  330 B, among others. 
     A computer system of a system  300  may be communicatively coupled to another part of system  300  in a wired fashion or in a wireless fashion. One of more of computer systems of system  300  may be communicatively coupled to a database, stored locally, on a remote computer system or a remote data center, or both, that store patient data, treatments plans, and/or other information associated with medical treatments and/or system  300 . In one example, the database may include a relational database. In a second example, the database may include a graph database. In another example, the database may include a “Not Only SQL” (NoSQL) database. 
     System  300  may enter information regarding patient  220  and the treatment to be performed on patient  220  or actually performed on patient  220 . System  300  may allow a user to enter and view information regarding patient  220  and the treatment to be performed on patient  220 . Such data may include information about patient  220 , such as identifying information, a medical history of patient  220 , and/or information about eye  222  being treated, among others. Such data may include information about the treatment plans, such as the shape and location of a corneal cut and/or a shape and location of ablation, among others. 
     Turning now to  FIG. 3C , an example of a microscope integrated display and examples of surgical tooling equipment are illustrated. As shown, surgical tooling equipment  320 A may be or include a scalpel. As illustrated, surgical tooling equipment  320 B may be or include a Q-tip. As shown, surgical tooling equipment  320 C may be or include tweezers. Other surgical tooling equipment that is not specifically illustrated may be utilized with one or more systems, one or more processes, and/or one or more methods described herein. 
     As an example, surgical tooling equipment  320  may be marked with one or more patterns. The one or more patterns may be utilized in identifying surgical tooling equipment  320 . The one or more patterns may include one or more of a hash pattern, a stripe pattern, and a fractal pattern, among others. As another example, surgical tooling equipment  320  may be marked with a dye and/or a paint. The dye and/or the paint may reflect one or more of visible light, infrared light, and ultraviolet light, among others. In one example, an illuminator  378  may provide ultraviolet light, and image sensor  372  may receive the ultraviolet light reflected from surgical tooling equipment  320 . Computer system  330  may receive image data, based at least on the ultraviolet light reflected from surgical tooling equipment  320 , from image sensor  372  and may utilize the image data, based at least on the ultraviolet light reflected from surgical tooling equipment  320 , to identify surgical tooling equipment  320  from other image data provided by image sensor  372 . In another example, an illuminator  378  may provide infrared light, and image sensor  372  may receive the infrared light reflected from surgical tooling equipment  320 . Computer system  330  may receive image data, based at least on the infrared light reflected from surgical tooling equipment  320 , from image sensor  372  and may utilize the image data, based at least on the infrared light reflected from surgical tooling equipment  320 , to identify surgical tooling equipment  320  from other image data provided by image sensor  372 . 
     As illustrated, MID  350  may include eye pieces  352 A and  352 B. As shown, MID  350  may include displays  362 A and  362 B. Surgeon  310  may look into eye pieces  352 A and  352 B. In one example, display  362 A may display one or more images via eye piece  352 A. A left eye of surgeon  310  may utilize eye piece  352 A. In another example, display  362 B may display one or more images via eye piece  352 B. A right eye of surgeon  310  may utilize eye piece  352 B. Although MID  350  is shown with multiple displays, MID  350  may include a single display  362 . For example, the single display  362  may display one or more images via one or more of eye pieces  352 A and  352 B. MID  350  may be implemented with one or more displays  362 . 
     As shown, MID  350  may include image sensors  372 A and  372 B. In one example, image sensors  372 A and  372 B may acquire images. In a second example, image sensors  372 A and  372 B may include cameras. In another example, an image sensor  372  may acquire images via one or more of visible light, infrared light, and ultraviolet light, among others. One or more image sensors  372 A and  372 B may provide data of images to computer system  330 . Although MID  350  is shown with multiple image sensors, MID  350  may include a single image sensor  372 . MID  350  may be implemented with one or more image sensors  372 . 
     As illustrated, MID  350  may include distance sensors  374 A and  374 . For example, a distance sensor  374  may determine a distance to surgical tooling equipment  320 . Distance sensor  374  may determine a distance associated with a Z-axis. Although MID  350  is shown with multiple image sensors, MID  350  may include a single distance sensor  374 . In one example, MID  350  may be implemented with one or more distance sensors  374 . In another example, MID  350  may be implemented with no distance sensor. 
     As shown, MID  350  may include lenses  376 A and  376 B. Although MID  350  is shown with multiple lenses  376 A and  376 B, MID  350  may include a single lens  376 . MID  350  may be implemented with one or more lenses  376 . As illustrated, MID  350  may include illuminators  378 A and  378 B. For example, an illuminator  378  may provide and/or produce one or more of visible light, infrared light, and ultraviolet light, among others. Although MID  350  is shown with multiple illuminators, MID  350  may include a single illuminator  378 . MID  350  may be implemented with one or more illuminators  378 . MID  350  may include one or more structures and/or one or more functionalities as those described with reference to biometry device  214 . In one example, MID  350  may include OLCR device  266 . In another example, MID  350  may include wavefront device  268 . MID  350  may include a biometry device  214 . MID  350  may include an optical system  110 . 
     Turning now to  FIG. 3D , another example of a medical system is illustrated. As shown, a medical system  300 C may include a suction cone  380 . For example, suction cone  380  may be or include an aplenation cone. As illustrated, suction cone  380  may include an optical system  110 . As shown, a computer system  330  may be coupled to a control device  382  of suction cone  380 . For example, computer system  330  may control suction cone  380  via control device  382 . After a suction ring  384  is docked with an eye  222 , suction cone  380  may be docked with suction ring  384 . As illustrated, suction cone  380  may include a lens  386 . Although lens  386  is illustrated as flat or planar, lens  386  may include concave shape and/or may include convex shape. If lens  386  is planar, lens  386  may be referred to as an aplenation plane. 
     As illustrated, medical system  300 C may include a vacuum system  390 . As shown, vacuum system  390  may be communicatively coupled to computer system  330 . For example, computer system  330  may control vacuum system  390 . Vacuum system  390  may create one or more low pressures via one or more of lines  392  and  394 . For example, vacuum system  390  may create one or more low pressures via line  394  to adhere and/or seal a suction ring  384  to an eye  222  of a patient. As shown, medical system  300 C may include lines  392  and  394  and suction ring  384 . 
     Turning now to  FIG. 4 , an example of a computer system is illustrated. As shown, a computer system  400  may include a processor  410 , a volatile memory medium  420 , a non-volatile memory medium  430 , and an input/output (I/O) device  440 . As illustrated, volatile memory medium  420 , non-volatile memory medium  430 , and I/O device  440  may be communicatively coupled to processor  410 . 
     The term “memory medium” may mean a “memory”, a “storage device”, a “memory device”, a “computer-readable medium”, and/or a “tangible computer readable storage medium”. For example, a memory medium may include, without limitation, storage media such as a direct access storage device, including a hard disk drive, a sequential access storage device, such as a tape disk drive, compact disk (CD), random access memory (RAM), read-only memory (ROM), CD-ROM, digital versatile disc (DVD), electrically erasable programmable read-only memory (EEPROM), flash memory, non-transitory media, and/or one or more combinations of the foregoing. As shown, non-volatile memory medium  430  may include processor instructions  432 . Processor instructions  432  may be executed by processor  410 . In one example, one or more portions of processor instructions  432  may be executed via non-volatile memory medium  430 . In another example, one or more portions of processor instructions  432  may be executed via volatile memory medium  420 . One or more portions of processor instructions  432  may be transferred to volatile memory medium  420 . 
     Processor  410  may execute processor instructions  432  in implementing at least a portion of one or more systems, one or more flow charts, one or more processes, and/or one or more methods described herein. For example, processor instructions  432  may be configured, coded, and/or encoded with instructions in accordance with at least a portion of one or more systems, one or more flowcharts, one or more methods, and/or one or more processes described herein. Although processor  410  is illustrated as a single processor, processor  410  may be or include multiple processors. One or more of a storage medium and a memory medium may be a software product, a program product, and/or an article of manufacture. For example, the software product, the program product, and/or the article of manufacture may be configured, coded, and/or encoded with instructions, executable by a processor, in accordance with at least a portion of one or more systems, one or more flowcharts, one or more methods, and/or one or more processes described herein. 
     Processor  410  may include any suitable system, device, or apparatus operable to interpret and execute program instructions, process data, or both stored in a memory medium and/or received via a network. Processor  410  further may include one or more microprocessors, microcontrollers, digital signal processors (DSPs), application specific integrated circuits (ASICs), or other circuitry configured to interpret and execute program instructions, process data, or both. 
     I/O device  440  may include any instrumentality or instrumentalities, which allow, permit, and/or enable a user to interact with computer system  400  and its associated components by facilitating input from a user and output to a user. Facilitating input from a user may allow the user to manipulate and/or control computer system  400 , and facilitating output to a user may allow computer system  400  to indicate effects of the user&#39;s manipulation and/or control. For example, I/O device  440  may allow a user to input data, instructions, or both into computer system  400 , and otherwise manipulate and/or control computer system  400  and its associated components. I/O devices may include user interface devices, such as a keyboard, a mouse, a touch screen, a joystick, a handheld lens, a tool tracking device, a coordinate input device, or any other I/O device suitable to be used with a system. 
     I/O device  440  may include one or more busses, one or more serial devices, and/or one or more network interfaces, among others, that may facilitate and/or permit processor  410  to implement at least a portions of one or more systems, processes, and/or methods described herein. In one example, I/O device  440  may include a storage interface that may facilitate and/or permit processor  410  to communicate with an external storage. The storage interface may include one or more of a universal serial bus (USB) interface, a SATA (Serial ATA) interface, a PATA (Parallel ATA) interface, and a small computer system interface (SCSI), among others. In a second example, I/O device  440  may include a network interface that may facilitate and/or permit processor  410  to communicate with a network. I/O device  440  may include one or more of a wireless network interface and a wired network interface. In a third example, I/O device  440  may include one or more of a peripheral component interconnect (PCI) interface, a PCI Express (PCIe) interface, a serial peripheral interconnect (SPI) interface, and an inter-integrated circuit (I 2 C) interface, among others. In a fourth example, I/O device  440  may include circuitry that may permit processor  410  to communicate data with one or more sensors. In a fifth example, I/O device  440  may facilitate and/or permit processor  410  to communicate data with one or more of a display  450  and a MID  460 , among others. In another example, I/O device  440  may facilitate and/or permit processor  410  to communicate data with an imaging device  470 . As illustrated, I/O device  440  may be coupled to a network  480 . For example, I/O device  440  may include a network interface. 
     Network  480  may include a wired network, a wireless network, an optical network, or a combination of the foregoing, among others. Network  480  may include and/or be coupled to various types of communications networks. For example, network  480  may include and/or be coupled to a local area network (LAN), a wide area network (WAN), an Internet, a public switched telephone network (PSTN), a cellular telephone network, a satellite telephone network, or a combination of the foregoing, among others. A WAN may include a private WAN, a corporate WAN, a public WAN, or a combination of the foregoing, among others. 
     A computer system described herein may include one or more structures and/or one or more functionalities as those described with reference to computer system  400 . In one example, computer system  152  may include one or more structures and/or one or more functionalities as those described with reference to computer system  400 . In a second example, computer system  212  may include one or more structures and/or one or more functionalities as those described with reference to computer system  400 . In a third example, computer system  330  may include one or more structures and/or one or more functionalities as those described with reference to computer system  400 . In another example, a computer system of MID  350  may include one or more structures and/or one or more functionalities as those described with reference to computer system  400 . 
     Turning now to  FIG. 5 , an example of a method of operating an optical system is illustrated. At  510 , a laser beam may be generated. For example, laser  120  may generate a laser beam. Computer system  152  may provide control information, that indicates generating a laser beam, to laser  120 . For example, laser  120  may receive the control information from computer system  152  and generate the laser beam in accordance with the control information. 
     At  515 , the laser beam may be directed to a test surface. For example, focusing optics  140  may direct the laser beam to surface  112 . Focusing optics  140  may reflect a portion of the laser beam. A remainder of the laser beam may travel to surface  112 . At  520 , a reflected portion of the laser beam may be directed to TPA detector  130 . For example, detector optics  122  may direct the reflected portion of the laser beam to TPA detector  130 . The reflected portion of the laser beam may be reflected from surface  112 . 
     At  525 , an intensity of the reflected portion of the laser beam may be determined. For example, TPA detector  130  may determine an intensity of the reflected portion of the laser beam. TPA detector  130  may transform the intensity of the reflected portion of the laser beam into digital data that indicates the intensity of the reflected portion of the laser beam. TPA detector  130  may provide the digital data that indicates the intensity of the reflected portion of the laser beam to computer system  152 . Computer system  152  may receive the digital data that indicates the intensity of the reflected portion of the laser beam. 
     At  530 , it may be determined if the intensity of the reflected portion of the laser beam is a maximum intensity. The intensity of the reflected portion of the laser beam may be a peak intensity as photons of the reflected portion of the laser beam may behave as a wave. Computer system  152  may determine, from the digital data that indicates the intensity of the reflected portion of the laser beam, if the intensity of the reflected portion of the laser beam is a maximum intensity. Determining if the intensity of the reflected portion of the laser beam is a maximum intensity may include comparing the intensity of the reflected portion of the laser beam with other one or more intensities of repetitive other reflected portions of the laser beam. For example, computer system  152  may store and/or access the other one or more intensities via memory medium. 
     If the signal is not at the maximum intensity, focusing optics  140  may be adjusted, at  535 . For example, computer system  152  may adjust focusing optics  140 . Computer system  152  may provide, to focusing optics  140 , control information that indicates at least one adjustment of focusing optics  140 . For example, computer system  152  may provide, to beam expander  141 , control information that indicates at least one adjustment of one or more of lenses  142 A and  142 B. Adjusting focusing optics  140  may direct a focal point of the laser beam to a different location with respect to the Z-axis. For example, adjusting focusing optics  140  may direct a focal point of the laser beam toward or away from surface  112 . The method may proceed to  510 . 
     If the signal is at the maximum, it may be determined that the focal point is at surface  112 , at  540 . For example, computer system  152  may determine that the focal point is at surface  112 . Interpolation may be utilized to refine a position of surface  112 . At  545 , results may be provided. For example, computer system  152  may provide results. Providing the results may include one or more of displaying the results via a display, printing the results via a printer, storing the results to a memory medium, and sending the result to a communication network, among others. 
     Turning now to  FIG. 6 , an example of a method of determining if an objective lens is associated with an issue. At  610 , multiple first portions of a laser beam may be provided to an objective lens of an optical system. Providing the multiple first portions of the laser beam to the objective lens may include directing the multiple first portions of the laser beam to the objective lens. For example, one or more of polarizer  124 , waveplate  134 , beam expander  141 , and scanner  144  may direct the multiple first portions of the laser beam to objective lens  148 . 
     At  615 , the multiple first portions of the laser beam may be provided to respective multiple locations of a test surface. In one example, objective lens  148  may provide the multiple first portions of the laser beam to respective multiple locations  710 A- 710 M of surface  112 , as illustrated in  FIG. 7A . In a second example, objective lens  148  may provide multiple first portions  720 A- 720 C of the laser beam to respective multiple locations of surface  112 , as illustrated in  FIG. 7B . In a third example, objective lens  148  may provide multiple first portions  720 A and  720 B of the laser beam to respective multiple locations of surface  112 , as illustrated in  FIG. 7D . In a fourth example, objective lens  148  may provide multiple first portions  720 A and  720 B of the laser beam to respective multiple locations of surface  112 , as illustrated in  FIG. 7F . In another example, objective lens  148  may provide multiple first portions  720 A and  720 B of the laser beam to respective multiple locations of surface  112 , as illustrated in  FIG. 7H . First portions  720  of the laser beam may include multiple photons. Although surface  112  is illustrated as circular in  FIGS. 7A-7M , surface  112  may be any shape. For example, surface  112  may be rectangular, polygonal, etc. Providing the multiple first portions of the laser beam to respective multiple locations of a test surface may include utilizing scanner  144 . For example, the multiple first portions of the laser beam may be controlled via scanner  144  to sequentially provide to respective multiple locations of the test surface. 
     At  620 , multiple second portions of the laser beam may be received from the test surface. For example, objective lens  148  may receive multiple second portions of the laser beam from surface  112 . The second portions of the laser beam may be reflected by the test surface. In one example, second portions  730 A- 730 C of the laser beam may be reflected by surface  112 , as illustrated in  FIG. 7C . In a second example, second portions  730 A and  730 B of the laser beam may be reflected by surface  112 , as shown in  FIG. 7E . In a third example, second portions  730 A and  730 B of the laser beam may be reflected by surface  112 , as illustrated in  FIG. 7G . In another example, second portions  730 A and  730 B of the laser beam may be reflected by surface  112 , as shown in  FIG. 7I . Second portions  730  of the laser beam may include multiple photons. For example, second portions  730  of the laser beam may include multiple photons of the multiple photons associated with first portions  720  of the laser beam. As illustrated in  FIG. 7E , objective lens  148  may not receive second portions  730 B of the laser beam. For example, second portions  730 B may not be reflected to objective lens  148 , as shown in  FIG. 7E . As illustrated in  FIG. 7I , diaphragm  160  may block or obstruct second portions  730 B. For example, diaphragm  160  may block or obstruct second portions  730 B from reaching TPA detector  130 . The second portions of the laser beam may be respectively associated with the multiple first portions of the laser beam reflected from the test surface. 
     At  625 , the multiple second portions of the laser beam may be provided to a TPA detector. For example, the multiple second portions of the laser beam may be provided to TPA detector  130 . One or more of multiple second portions  730 A- 730 C may be provided to TPA detector  130 . Providing the multiple second portions of the laser beam to the TPA detector may include directing the multiple second portions of the laser beam to the TPA detector. For example, one or more of scanner  144 , beam expander  141 , waveplate  134 , polarizer  124 , and lens  128  may direct one or more of multiple second portions  730 A- 730 C of the laser beam to TPA detector  130 . 
     At  630 , multiple intensities respectively associated with the multiple second portions of the laser beam may be determined. For example, TPA detector  130  may determine multiple intensities respectively associated with the multiple second portions of the laser beam. Second portions  730 A- 730 C may be associated with respective multiple intensities. Second portions  730 A- 730 C may be associated with respective same or similar multiple intensities. In one example, TPA detector  130  may determine a first intensity associated with multiple second portions  730 A of the laser beam. In a second example, TPA detector  130  may determine a second intensity associated with multiple second portions  730 A and  730 B of the laser beam. The second intensity may be greater than the first intensity. In another example, TPA detector  130  may determine a third intensity associated with multiple second portions  730 A- 730 C of the laser beam. The third intensity may be greater than the second intensity. Although three multiple second portions  730 A- 730 C are illustrated as examples, other multiple second portions  730  may be present and/or utilized. 
     At  635 , the multiple intensities may be transformed into data that represents multiple measurements of the multiple intensities. In one example, TPA detector  130  may transform the multiple intensities into data that represents multiple measurements of the multiple intensities. TPA detector  130  may provide the data that represents multiple measurements of the multiple intensities to computer system  152 . TPA detector  130  may transform the first intensity associated with multiple second portions  730 A of the laser beam into first data that represents a measurement value of the first intensity. TPA detector  130  may transform the second intensity associated with multiple second portions  730 A and  730 B of the laser beam into second data that represents a measurement value of the second intensity. TPA detector  130  may transform the third intensity associated with multiple second portions  730 A- 730 C of the laser beam into third data that represents a measurement value of the third intensity. 
     In another example, an analog to digital converter (ADC) may transform signals from TPA detector  130  associated with the multiple intensities into digital data that represents multiple measurements of the multiple intensities. The ADC may transform analog signals from TPA detector  130  associated with the first intensity associated with multiple second portions  730 A of the laser beam into first data that represents a measurement value of the first intensity. The ADC may transform analog signals from TPA detector  130  associated with the second intensity associated with multiple second portions  730 A and  730 B of the laser beam into second data that represents a measurement value of the second intensity. The ADC may transform analog signals from TPA detector  130  associated with the third intensity associated with multiple second portions  730 A- 730 C of the laser beam into third data that represents a measurement value of the third intensity. 
     Computer system  152  may receive the data that represents multiple measurements of the multiple intensities. In one example, computer system  152  may receive the first data that represents the measurement value of the first intensity. In a second example, computer system  152  may receive the second data that represents the measurement value of the second intensity. In another example, computer system  152  may receive the third data that represents the measurement value of the third intensity. 
     At  640 , it may be determined, from the data, if an intensity value of the multiple intensities is below a threshold intensity value. The intensity value of the multiple intensities may be a peak intensity value as photons of a portion of the laser beam may behave as a wave. The threshold intensity value may be a minimum intensity value. An intensity value may be below the threshold intensity value if portions of the laser beam are not received by objective lens  148 . In one example, portions  730 B of the laser beam may not be received by objective lens  148 , as illustrated in FIG.  7 E. In another example, diaphragm  160  may block portions  730 B of the laser beam, as illustrated in  FIG. 7I . Any of these examples may contribute to the intensity value being below the threshold intensity value or may cause the intensity value being below the threshold intensity value. If portions of the laser beam are not received by objective lens  148 , the portions of the laser beam may not be provided to TPA detector  130 . 
     One or more aberrations of objective lens  148  may cause one or more errors in one or more focuses of objective lens  148 . In one example, the one or more aberrations of objective lens  148  may cause a focus of objective lens  148  to be beyond surface  112 , as illustrated in  FIG. 7K . As shown, a focus point  740 A may be beyond surface  112 . As illustrated in  FIG. 7L , second portions  730 A and  730 B may not return along paths associated with first portions  720 A and  720 B, respectively. In another example, the one or more aberrations of objective lens  148  may cause a focus of objective lens  148  to be short of surface  112 , as shown in  FIG. 7M . As shown, a focus point  740 B may be short of surface  112 . As illustrated in  FIG. 7N , second portions  730 A and  730 B may not return along paths associated with first portions  720 A and  720 B, respectively. 
     When objective lens  148  causes first portions  720  to not be focused on surface  112  at a location  710 , second portions  730  may not return along paths associated with first portions  720 . For example, objective lens  148  may cause a focus  740  of first portions  720  to not be on surface  120 , as illustrated in  FIGS. 7J and 7L . When second portions  730  do not return along paths associated with first portions  720 , one or more intensities of the second portions of the laser beam may be diminished. In one example, second portions  730  may not return along paths associated with first portions  720 , as shown in  FIGS. 7K, and 7M . In another example, second portions  730 , as illustrated in  FIGS. 7E and 7I , may be caused by objective lens  148  not focusing first portions  720  on surface  112 , as shown in  FIGS. 7D and 7H , respectively. 
     If the intensity value of the multiple intensities is below the threshold intensity value, information that indicates an issue associated with the objective lens may be provided, at  645 . Providing the information that indicates the issue associated with the objective lens may include one or more of displaying, via a display, the information that indicates the issue associated with the objective lens; storing, via a memory medium, the information that indicates the issue associated with the objective lens; and sending, to a network, the information that indicates the issue associated with the objective lens, among others. If the information that indicates an issue associated with an objective lens, the objective lens may be repaired or replaced. 
     If the intensity value of the multiple intensities is not below the threshold intensity value, information that indicates there is no issue associated with the objective lens may be provided, at  650 . Providing the information that indicates there is no issue associated with the objective lens may include one or more of displaying, via a display, the information that indicates there is no issue associated with the objective lens; storing, via a memory medium, the information that indicates there is no issue associated with the objective lens; and sending, to a network, the information that indicates there is no issue associated with the objective lens, among others. 
     One or more of the method and/or process elements and/or one or more portions of a method and/or processor elements may be performed in varying orders, may be repeated, or may be omitted. Furthermore, additional, supplementary, and/or duplicated method and/or process elements may be implemented, instantiated, and/or performed as desired. Moreover, one or more of system elements may be omitted and/or additional system elements may be added as desired. 
     A memory medium may be and/or may include an article of manufacture. For example, the article of manufacture may include and/or may be a software product and/or a program product. The memory medium may be coded and/or encoded with processor-executable instructions in accordance with one or more flowcharts, systems, methods, and/or processes described herein to produce the article of manufacture. 
     The above disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other implementations which fall within the true spirit and scope of the present disclosure. Thus, to the maximum extent allowed by law, the scope of the present disclosure is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description.