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18 June 2024 Novel testing technique for coated plane parallel optics
Rafael Porcar-Guezenec, Diego Ormaechea, Nicolas Lefaudeux, Xavier Levecq
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Proceedings Volume PC13021, Optical Fabrication and Testing VIII; PC1302106 (2024) https://doi.org/10.1117/12.3017246
Event: SPIE Optical Systems Design, 2024, Strasbourg, France
Abstract
Optics integrators and users are increasingly demanding that parts be tested after coating. For dichroic and filter manufacturers, this can be difficult for two main reasons. Firstly, the spectral properties of these parts once treated may not be compatible with the 632.8 nm HeNe wavelength, on which common metrology tools such as Fizeau interferometers are based. Secondly, the shape of these samples, with their flat, parallel surfaces, makes them prone to generating back reflections that are difficult to eliminate and affect the accuracy of surface shape reconstruction. Imagine Optic has developed and patented a new approach called POP that brings easy access to the optical testing of such samples, based on the combination of incoherent light at any wavelength and Shack Hartmann wavefront sensing. We will present the technique principle and how it works as implemented in a metrology system we called MESO. We will report the validation process of the approach and showcase results on real samples highlighting the advantages of the technique.
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Rafael Porcar-Guezenec, Diego Ormaechea, Nicolas Lefaudeux, and Xavier Levecq "Novel testing technique for coated plane parallel optics", Proc. SPIE PC13021, Optical Fabrication and Testing VIII, PC1302106 (18 June 2024); https://doi.org/10.1117/12.3017246
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KEYWORDS
Optics manufacturing
Coating
Metrology
Optical testing
Tunable filters
Optical filters
Reflection
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