Characterization of coatings for straylight and photoluminescence suppression in the Raman Spectrometer for MMX (RAX)

Conor Ryan; Ute Böttger; Maximilian Buder; Yuichiro Cho; Sven Gutruf; Till Hagelschuer; Martin Pertenais; Andreas Pohl; Selene Routley; Friedrich Schrandt; Sergey G. Pavlov

doi:10.1117/12.2627219

29 August 2022 Characterization of coatings for straylight and photoluminescence suppression in the Raman Spectrometer for MMX (RAX)

Conor Ryan, Ute Böttger, Maximilian Buder, Yuichiro Cho, Sven Gutruf, Till Hagelschuer, Martin Pertenais, Andreas Pohl, Selene Routley, Friedrich Schrandt, Sergey G. Pavlov

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121884N (2022) https://doi.org/10.1117/12.2627219
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

The Martian Moons eXploration (MMX) mission led by JAXA to Mars moons Phobos and Deimos involves a small rover developed by DLR/CNES that will be operating on Phobos’ surface. Aboard it is the Raman Spectrometer for MMX (RAX), whose main scientific objectives address Phobos surface mineralogy, its heterogeneity and relation to the Mars mineralogy. Raman spectrometers require strong suppression of straylight, since this technique operates with few nano-Watt signals that should have significant contrast to all other sources of light inside the instrument. The mission requirements involving RAX call for a compact and sophisticated optical design, precluding space for straylight suppressive elements. To optimize straylight suppression in RAX, Raman scattering, Photoluminescence and reflection were characterized for candidate coatings representing different absorbing materials and fabrication technologies over spectral ranges between 530 nm and 680 nm. This was complimented by mechanical testing to aid selection of the coatings for parts inside the RAX flight model.

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Conor Ryan, Ute Böttger, Maximilian Buder, Yuichiro Cho, Sven Gutruf, Till Hagelschuer, Martin Pertenais, Andreas Pohl, Selene Routley, Friedrich Schrandt, and Sergey G. Pavlov "Characterization of coatings for straylight and photoluminescence suppression in the Raman Spectrometer for MMX (RAX)", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121884N (29 August 2022); https://doi.org/10.1117/12.2627219

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KEYWORDS

Raman spectroscopy

Optical coatings

Spectroscopy

Reflection

Titanium

Aluminum

Oxides

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