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Easy to use Computer Generated Holograms for Complex Surface Metrology

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Author: Dr. Florian Hudelist
Tuesday, June 1, 2021

There are many metrology methods on the market for testing aspheres. The method with one of the highest known accuracies is based on a Fizeau interferometer, in combination with a CGH. We describe a so called DFNL type CGH, having the CGH diffractive structures integrated into the Fizeau reference surface, which provides a solution for measuring complex shapes that is comparable to the traditional methods used for testing spheres. Compared to a standard CGH, the DFNL simplifies the hardware and alignment steps required to measure a complex optical surface.

File: Whitepaper_DIOPTIC_DFNL.pdf (991.59 KB)
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manufacturing equipment for photonic componentsoptical components & softwaretest & measurement equipmentinspectionidentificationnondestructive testingquality controlinterferometrysurface metrologyCGHCGH Null Llensaspheresfreeform surfacesinterferometersDFNLreference opticstransmission spherescylinder lenseswavefront
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