Newsletter TRIOPTICS Global | English WaveSensor & WaveMaster® Shack-Hartmann wavefront sensors To ensure the implementation of the complex optical designs after production, a qualified measuring technology must be used. Wavefront measurement is particularly well-suited for this purpose, since it determines the image quality on a spatially-resolved basis, i.e. over all field angles, and across the entire sample aperture. In contrast to traditional MTF testing, this not only results in a point-based measure of quality, but also in a continuous alignment across the entire aperture. High flexibility With a maximum dynamic range of up to 2000 λ, WaveSensor and WaveMaster® allow high flexibility in the lens design to be measured. Repeatable high precision In addition to a measuring accuracy of up to λ/20 (RMS), a high repeatability of λ/200 (RMS) can also be achieved due to the compact, robust and vibration-resistant design. Immediate evaluation In real time, the results of the measured wavefront data are compared and evaluated with those of the sample lenses or the design values. Product Overview These sensors analyze entire optical arrangements or individual surfaces in real time, delivering the determination of the wavefront (PV, RMS), the Zernike coefficients, the Point Spread Function (PSF), the Modulation Transfer Function (MTF), the Strehl ratio, the radius of curvature and the aspherical coefficients. They thereby enable conclusions to be drawn not only about quality control, but also about the production process. More... WaveMaster® PRO 2 / PRO 2 Wafer / PRO 2 Plan Serial testing of lens and wafers WaveMaster® PRO 2 is used for series testing of lens assemblies and optical wafers Fully automatic measurement of high sample volumes (wafers or loaded trays) Measurement time of less than 3 seconds per lens and measurement step provides for high sample throughput High repeatability More information WaveMaster® Field Off-axis wavefront measurment The WaveMaster® Field is designed for testing single lenses and objectives under high field angles. Universal wavefront inspection at field angles of up to 60° Flexible and simple adjustment of individual angles of incidence and wavelengths Variable sample holder allows adaptation to different sample types – ideal for R&D More information WaveMaster® Plan Measurement of plane samples The WaveMaster® Plan is suitable for the quality inspection of flat surfaces using wavefront analysis by Shack-Hartmann sensors. Comprehensive wavefront analysis of flat optical elements Fast and easy measurement: Sample is placed manually and adjusted via an X-Y table Stable and environment-independent measurement system through vibration-resistant structure WaveMaster® Compact 2 Measurement in transmission for R&D WaveMaster® Compact 2 offers wavefront measurement of single lenses and optical systems in quality control. Wavefront measurement of single lenses in research and development and for quality control Measurement and analysis of the complete lens assembly in transmission WaveMaster® Compact 2 Reflex Testing in reflection for R&D WaveMaster® Compact 2 Reflex allows the measurement of the surface topography and the radius of curvature of single lenses Wavefront measurement of single lenses in research and development and for quality control Measurement and analysis of surface topology in reflection WaveMaster® Compact 2 Universal Testing in transmission & reflection Combined wavefront and surface topographical measurement are possible with have WaveMaster® Compact 2 Universal. Wavefront measurement of single lenses in research and development and for quality control Measurement and analysis of the entire optic in transmission and the surface topology in reflection WaveMaster® UST Universal testing of stepper objectives WaveMaster® UST allows fully automated wavefront measurement of bilateral telecentric lenses Complete, off-axial mapping of large bilateral telecentric lenses (up to 300 kg in weight) through wavefront measurement Universal use for field sizes up to 70 x 45 mm² (objet plane) or 100 x 100 mm² (image plane) Simple and fast measurements through a high degree of automation WaveMaster® IOL 2 Wavefront mapping of intraocular lenses Wavefront measurement with the WaveMaster® IOL 2 enables power mapping of intraocular lenses. Universal measuring system for quality control of all common refractive intraocular lenses: monofocal, toric, spherical and aspherical Measurement of hydrophobic and hydrophilic lenses in air or in the optionally heated in-situ model eye according to ISO 11979 Fully automated and user independent determination of lens aberrations, MTF, EFL and PSF More information Request WaveMaster® Applications The demand for compact lens systems that are characterized by small size and low weight leads, in many cases, to the replacement of multiple spherical lenses with one aspherical optical arrangement. In addition, quality controls already performed during production are becoming more important. In many cases conventional processes cannot be used for these measurement tasks. Wavefront measurement with Shack-Hartmann sensors represents the solution of choice here, due to its large dynamic range. Software WaveSensor or WaveMaster® Software The software is comprehensively structured, user friendly and includes all of the functions required to measure and analyze spherical and aspherical samples with a WaveSensor®or WaveMaster®. As a result of their flexible configurability, all important measurement results are displayed. The software communicates with the Shack-Hartmann sensor and analyzes the measured wavefront in real time. In addition, the WaveMaster® controls measurement systems in order to align samples, for example. Clear, menu-guided and configurable operation Simple and intuitive measurement and analysis of wavefronts of the entire lens assembly or on surfaces in real time One software for everything: Data acquisition, data calculation, calibration and display of data Absolute and relative measurement mode for instant comparison with the theoretical design data from ZEMAX and Code V or with a reference lens Complete documentation through output of measurement certificates Clear depiction in adjustable measurement and analysis range of 2D wavefront PV and RMS Intensity Camera image Complete depiction of surface topography through multiple parameterizations: Aspherical equation Zernike polynomials Conical equation Spherical equation Free-form surface Technical Data Shack-Hartmann Sensor WaveSensor 150 150 with reflex module Sensor area 15 mm x 15 mm 15 mm x 15 mm Wavelength 405 nm ... 1,100 nm1) 405 nm ... 1,100 nm1) Wavefront accuracy < λ/20 (RMS) 0.05 μm (RMS) Wavefront repeatability < λ/200 (RMS) 0.005 μm (RMS) Dynamic range 2,000 λ 2,000 λ Measurement frequency up to 12 Hz up to 12 Hz Lateral resolution 138 x 138 microlenses 138 x 138 microlenses Research & Development WaveMaster® Compact 2 Compact 2 Reflex Compact 2 Universal Sample diameter 0.5 mm ... 14 mm2),3) 4.5 mm ... 18 mm3),5) Transmission: 0.5 mm ... 14 mm2),3) Reflection: 4.5 mm ... 14 mm3),5) Flange focal length -30 mm ... +100 mm4) -30 mm ... +100 mm4) Radius of curvature -50 mm ... 300 mm6) -50 mm ... 30 mm6) Sample holder Single seat, manual positioning Single seat, manual positioning Single seat, manual positioning Maximum asphericity ≤ 7°7) ≤ 7°7) WaveMaster® Plan Field UST Sample diameter 0,5 mm ... 14 mm2), 3) 0,5 mm ... 14 mm2), 3) up to 1,100 mm x 650 mm x 1,200 mm Sample holder Single seat, manual positioning Single seat, manual positioning Interface for customized lens holders Maximum sample weight 450 kg Maximum distance between object and image plane 1,200 mm Max. field dimensions image side ±20 mm 100 mm x 100 mm Max. field dimensions object side ±70° 70 mm x 45 mm Production WaveMaster® PRO 2 PRO 2 Wafer PRO 2 Plan Sample diameter 0.5 mm ... 14 mm2) 0.5 mm ... 14 mm2) 0.5 mm ... 14 mm2) FFL (Flange focal length) -12 mm ... +50 mm2) -12 mm ... +50 mm4) Sample holder Tray Wafer holder Tray Measurement time per lens < 3 s8) < 3 s8) < 3 s8) Sample throughput per hour ≥ 1,200 lens8) ≥ 1,200 lens3) ≥ 1,200 lens8) Lens per tray Max. 1482) Max. 1482) Exchange time for tray of lenses 10 s 10 s 10 s Wafer tray exchange time, incl. Alignment < 2 min < 2 min < 2 min Setup time for new lens design < 5 min < 5 min < 5 min 1) In accordance with customer’s specification 2) Depending on telescope 3) More details upon request 4) Depending on microscope 5) Depending on radius of curvature and illumination lens 6) Depending on sample diameter and illumination lens 7) Local deviations from the best fit sphere 8) Depending on sample Download Technical Data Request WaveMaster® Upgrades & Accessories All of the WaveMaster® systems feature a flexible design and can thus be adapted to the specific requirements of your application. WaveSensor & WaveMaster® General A complete analysis is possible by an individual adjustment to the sample. Kinematic mounts enable the simple exchange of light sources and telescopes. Light sources with different wavelength and numerical aperture Telescopes for achieving optimal magnification between sample and sensor Lens assemblies for surfaces with different radii of curvature Sample holders and trays Reference samples WaveSensor & WaveMaster® Software WaveMaster® IOL 2 Knowledge Base Wavefront measurement with Shack-Hartmann sensors Operating principle of a Shack-Hartmann sensor and wavefront analysis The standard design of a Shack-Hartmann sensor consists of a CCD camera which is placed in the focal plane of a microlens array. An incoming wavefront is sampled by the lenses of the microlens array and the foci form a spot pattern on the camera which would be evenly spaced in case of a plane wavefront. Any aberration introduced by the sample lens leads to a curvature of the wavefront thus resulting in local wavefront tilts. These induce a measurable shift of each focus spot position. A numerical integration of the obtained slope information allows for reconstruction of the wavefront profile with high accuracy. High dynamic range compared to interferometers The dynamic range of a Shack-Hartmann sensor heavily depends on the algorithm which assigns each measured spot to the corresponding microlens. A wavefront is reconstructed only when this correlation is kept. Especially in case of stronger curved wavefronts sophisticated algorithms are needed since the simple assignment of a predefined searching area in the CCD plane of the size of a microlens is not sufficient anymore. Modern techniques achieve wavefront dynamic ranges up to 1500 A. Due to this high dynamic range Shack-Hartmann sensors are able to measure wavefronts with strong aberrations which are not accessible with interferometers anymore. More knowledge for experts This article inspired you? Are you looking for further knowledge transfer? Then you might also be interested in the following topics … Interferometer Schematic setup of a Shack-Hartmann sensor with an a) incoming plane wavefront and (b) incoming diverging Wavefront Zernike polynomials up to the 6th order Real time wavefront analysis zernike polynomials The measured wavefront is decomposed into a linear combination of Zernike polynomials which describe typical optical properties and errors of a lens or lens system as e.g. defocus, coma or astigmatism. The polynomial decomposition gives a numerical representation of any kind of aberration of the sample. These have basically two sources: aberrations directly linked to the design of the lens, most likely spherical terms, and asymmetric contributions due to lens errors. MTF, PSF and Strehl ratio The effects of aberrations are also characterized by calculating the Point Spread Function (PSF), Modulation Transfer Function (MTF or Strehl ratio of the optical system which are obtained from the wavefront. The MTF is as well-known as the modulus of the Optical Transfer Function. The wavefront measurement and its further analysis give a full spatially resolved description of the imaging characteristics of the lens under test. Different setups with Shack-Hartmann sensors Measurement setups in transmission and reflection Different configurations of the setup can be chosen for measuring the wavefront. Most important for the choice of configuration is whether the optical properties – using the transmission mode – or the lens shape – using the reflection mode – shall be analyzed Transmission mode Measurement in transmission provides information about the optical properties of the lenses or lens systems combining the influence of all surfaces as well as refractive index variations in the measured wavefront. Basic infinite setup In the basic transmission setup the sample lens is illuminated with collimated light. A lens in combination with a telescope is then used to collimate the beam again and image the wavefront onto the Shack-Hartmann sensor. In this setup the sample lens can be easily adjusted in its lateral and height position to achieve the best focus position with respect to the sensor. Finite setup in transmission Reverse infinite setup In this configuration the sample lens is illuminated by a point light source in the focal plane of the lens. The exit pupil of the lens is imaged onto the wavefront sensor by a telescope. The height position of the point light source, the lateral position of the sample lens and the image plane of the Shack- Hartmann sensor are chosen separately. The reverse infinite setup is used for the instruments WaveMaster® Compact 2 and WaveMaster® PRO. Finite setup In addition to the reverse setup, the lens is illuminated and tested in a configuration which is equal or close to the conditions of its dedicated application. This means the point light source is not located in the focal plane of the specimen, but at a distance specified by the design. For the complete imaging of the beam on the sensor, a collimating lens is added between sample lens and telescope. In this configuration. This configuration is only available with the instrument recommended for research and development. Reflection mode Measurements in reflection provide information about the topography of the sample surface. For this measurement the illumination unit with beam splitter is mounted in front of the wavefront sensor. A combination of collimating lens and telescope is used to illuminate the sample and image the reflected wavefront onto the Shack-Hartmann sensor. The reflection setup is available as an easy to attach module for all WaveSensor products. Single lesnes can be measured with using WaveMaster® Compact 2 Reflex and WaveMaster® Compact 2 Universal. 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