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DMDs for multi-object near-infrared spectrographs in astronomy
Author(s): Stephen A. Smee; Robert Barkhouser; Stephen Hope; Devin Conley; Aidan Gray; Gavin Hope; Massimo Robberto
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Paper Abstract

The Digital Micromirror Device (DMD), typically used in projection screen technology, has utility in instrumentation for astronomy as a digitally programmable slit in a spectrograph. When placed at an imaging focal plane the device can be used to selectively direct light from astronomical targets into the optical path of a spectrograph, while at the same time directing the remaining light into an imaging camera, which can be used for slit alignment, science imaging, or both. To date the use of DMDs in astronomy has been limited, especially for instruments that operate in the near infrared (1 - 2.5 μm). This limitation is due in part to a host of technical challenges with respect to DMDs that, to date, have not been thoroughly explored. Those challenges include operation at cryogenic temperature, control electronics that facilitate DMD use at these temperatures, window coatings properly coated for the near infrared bandpass, and scattered light. This paper discusses these technical challenges and presents progress towards understanding and mitigating them.

Paper Details

Date Published: 22 February 2018
PDF: 11 pages
Proc. SPIE 10546, Emerging Digital Micromirror Device Based Systems and Applications X, 105460L (22 February 2018); doi: 10.1117/12.2291184
Show Author Affiliations
Stephen A. Smee, Johns Hopkins Univ. (United States)
Robert Barkhouser, Johns Hopkins Univ. (United States)
Stephen Hope, Johns Hopkins Univ. (United States)
Devin Conley, Johns Hopkins Univ. (United States)
Aidan Gray, Johns Hopkins Univ. (United States)
Univ. of Maryland Baltimore County (United States)
Gavin Hope, Johns Hopkins Univ. (United States)
Aberdeen High School Science and Mathematics Academy (United States)
Massimo Robberto, Johns Hopkins Univ. (United States)
Space Telescope Science Institute (United States)

Published in SPIE Proceedings Vol. 10546:
Emerging Digital Micromirror Device Based Systems and Applications X
Michael R. Douglass; Benjamin L. Lee, Editor(s)

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