3 October 2011 Angular and spectral light scattering from complex multidielectric coatings
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Abstract
Due to the improvement of deposition technologies and polishing techniques, light scattering has been considerably reduced in optical coatings these last decades, with the result of high quality dense optical filters with minimal losses. However such improvements coupled with modern monitoring techniques have also allowed designing and producing more complex coatings with layer numbers exceeding several hundred in some situations. Within this framework light scattering must again be revisited and analysed in detail, including global loss levels together with angular and spectral analysis. This paper is devoted to the optical balance of sophisticated components for Earth Observation, where the same scene is observed simultaneously in several adjacent wavebands. Self-blocking multilayer stacks are involved to eliminate out-of band harmonics in the instrument but the filter performances are degraded due to an increase of cross talk originating from light scattering. To address this problem we use the theories of light scattering from surface roughness and bulk heterogeneity, which allows to quantity cross-talk levels and choose more adequate filters. A special emphasis is given to the case of hyperspectral filters assemblies located in the focal plane for image filtering.
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Catherine Grèzes-Besset, Didier Torricini, Hélène Krol, Myriam Zerrad, Michel Lequime, Claude Amra, "Angular and spectral light scattering from complex multidielectric coatings", Proc. SPIE 8168, Advances in Optical Thin Films IV, 81680D (3 October 2011); doi: 10.1117/12.897893; https://doi.org/10.1117/12.897893
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