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12 July 2023 High performances optical coatings for Earth observation and climate monitoring
Hélène Krol, Nathalie Valette, Colin Bondet de la Bernardie, Caroline Porta, E. Crocfer, C. Le Tallec, Grégory Chauveau, Didier Torricini, Catherine Grèzes-Besset
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Proceedings Volume 12777, International Conference on Space Optics — ICSO 2022; 1277751 (2023) https://doi.org/10.1117/12.2690905
Event: International Conference on Space Optics — ICSO 2022, 2022, Dubrovnik, Croatia
Abstract
For several years, CILAS has developed an expertise in the field of optical thin films deposition and in-situ visible and infrared optical monitoring techniques that enables us today to successfully answer such increasingly request of space systems for Earth observation and Climate monitoring. In particular, Dual Ion Beam Sputtering technology (DIBS) and Plasma Ion Assisted Deposition (PIAD) allow us to guarantee the production of coatings that are nearly insensitive to temperature and atmospheric conditions. We first present the results of the manufacturing of the high performances optical coatings for Microcarb Instrument. MicroCarb is designed to map sources and sinks of carbon dioxide (CO2), the most important greenhouse gas, on a global scale. The instrument on board MicroCarb is an infrared passive spectrometer operating in four wavelengths using an echelle grating to achieve spectral dispersion. In this paper, we present also the manufacturing results of a dichroic beamsplitter dedicated to Earth observation, which has been designed to transmit light in the [800-900nm] spectral range, whereas reflecting the [450-700nm] spectral range for 45° angle of incidence. The front face involves multidielectric coating structures based on high-pass functions. The rear face requires an antireflection coating in the [800-900nm] spectral range, designed to compensate the bending induced by the front face coating in order to reach the flatness requirements of 10 nm rms.
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Hélène Krol, Nathalie Valette, Colin Bondet de la Bernardie, Caroline Porta, E. Crocfer, C. Le Tallec, Grégory Chauveau, Didier Torricini, and Catherine Grèzes-Besset "High performances optical coatings for Earth observation and climate monitoring", Proc. SPIE 12777, International Conference on Space Optics — ICSO 2022, 1277751 (12 July 2023); https://doi.org/10.1117/12.2690905
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KEYWORDS
Optical coatings
Tunable filters
Manufacturing
Optical sensing
Optical filters
Antireflective coatings
Environmental monitoring
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