23 September 2015 Optical and mechanical properties of infrared thin film at cryogenic temperature
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For the most demanding infrared applications, fine knowledge of system performance under operational temperature is required. Management of thin film spectral and mechanical behaviour at cryogenic temperature is a key factor to improve infrared system performances.

Reosc recently investigated models and methods to anticipate measure and control effects of low temperature on coated optical components. Solutions have been developed in order to maximize highest performances under operational conditions. Effects of temperature on spectral transmission and flatness have been studied.

This work has been applied to narrow band pass filters and dichroic coatings working in the range 55K to 90K. Measurements show satisfying correspondence with model. On the basis of model prediction, process and design have then been adapted to improve performances at operational temperature. It has been applied to manufacturing of optics for MTG satellites and IASI NG instrument.
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Fabien Pradal, Fabien Pradal, Rémi Lhuillier, Rémi Lhuillier, Daniel Mouricaud, Daniel Mouricaud, } "Optical and mechanical properties of infrared thin film at cryogenic temperature", Proc. SPIE 9627, Optical Systems Design 2015: Advances in Optical Thin Films V, 96270A (23 September 2015); doi: 10.1117/12.2190979; https://doi.org/10.1117/12.2190979

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