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14 May 2007 Make it like you use it
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For spherical lenses, 3D in-process metrology is rather simple. Surface form may be tested in reflection using a test plate or a tower interferometer, and the polisher can rapidly assess the progress of the polishing process. For aspheric lenses 3D surface metrology is not easy. It often requires expensive, long lead time holograms or diffractive optical elements, a powerful interferometer and labor intensive setup by a skilled test technician. All of these factors combine into repeatability errors and suspect results. Looking deeper, there are specific geometries where it may be advantageous to look THROUGH the lens rather than AT the lens. Testing and correcting the aspheric lens as it is used, in transmission, addresses some of the shortcomings of traditional 3D surface metrology. This presentation will compare and contrast transmission testing versus surface testing for aspheric lenses. It will list specific cases where Optimax Systems chose transmission testing over surface metrology and the reasons for the choice. Additionally it will touch on the techniques and results of this transmission testing.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Brandon Light "Make it like you use it", Proc. SPIE 10316, Optifab 2007: Technical Digest, 103160L (14 May 2007);


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