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.