Far-UV Multi-Object Spectroscopy with Digital Micromirror Devices (Dmds)
SPACE TELESCOPES AND INSTRUMENTATION 2020 ULTRAVIOLET TO GAMMA RAY(2021)
Abstract
Digital micromirror devices (DMDs) can be used as versatile, rapidly reconfigurable object selectors in space-based multi-object spectrographs (MOS). DMDs are inexpensive, compact, reliable, high-throughput devices, that enable extremely flexible and efficient multi-object spectrographs; several DMD-based MOSs are currently being built for 4 m class ground-based telescopes. Previously, we have shown that DMDs are suitable for deployment and operation in space, in the near-UV and optical regimes (200 - 1000 nm). Using aluminum coatings protected with LiF and LiF/AlF3 films, we aim to extend the operational range of DMDs into the 100 - 200 nm FUV regime. Our initial coating runs produced DMDs with reflectivity > 40% in the range of 110 - 180 nm. Critically, the DMDs remain operational after the coating process. We will discuss potential for further improvement and introduce several mission concepts based on a FUV/NUV DMD MOS, that can be deployed on CubeSat and ESPA-class missions.
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Key words
ultraviolet,multi-object,spectroscopy,micromirror,mems,DMD,cubesat,smallsat
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