Patent ID: 11860091
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC B  G | IPC G

Claim 15:
16. An apparatus for in-situ inspection of an object, comprising:
a pulsed laser source;
a dichroic mirror configured to receive light from the pulsed laser source;
a probe illumination beam configured to be combined with the pulsed laser source with the dichroic mirror to form a collinear optical light path to focus and deliver the optical light path at a same region on the surface;
a photo-detector sub-assembly configured to sample and measure collected back-scattered light reflected from the region,
an optical reflector having a thru-hole opening and configured to collect back-scattered light from the probe illumination beam, wherein a portion of the collected back-scattered light reflected off a region on the target surface is separated, transported back to an optical surface inspection device and a portion is reflected and directed toward the photo-detector sub-assembly;
a control optics assembly having an optical device configured to shape, focus, and superimpose focal spots of the probe illumination beam onto the region of the target surface;
a positioning motion stage assembly configured to control, position and track a position of the probe illumination beam on the target surface;
a system control unit configured to control, monitor and track a position of the probe illumination beam on the target surface and control the probe illumination beam; and
an imaging device configured to construct an image of the surface with at least one pixel and at least one pixel value, wherein each pixel represents a region on the surface and each pixel value represents a value of collected probe light at a region of a defined position and wherein the constructed image is used to adjust the laser pulse intensities for predetermined modifications to other regions.