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Proceedings Paper

Optical evaluation of digital micromirror devices (DMDs) with UV-grade fused silica, sapphire, and magnesium fluoride windows and long-term reflectance of bare devices
Author(s): Manuel A. Quijada; Anton Travinsky; Dmitry Vorobiev; Zoran Ninkov; Alan Raisanen; Massimo Robberto; Sara Heap
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Paper Abstract

Digital micromirror devices (DMDs) are commercial micro-electromechanical systems, consisting of millions of mirrors which can be individually addressed and tilted into one of two states (±12°). These devices were developed to create binary patterns in video projectors, in the visible range. Commercially available DMDs are hermetically sealed and extremely reliable. Recently, DMDs have been identified as an alternative to microshutter arrays for space-based multi-object spectrometers (MOS). Specifically, the MOS at the heart of the proposed Galactic Evolution Spectroscopic Explorer (GESE) uses the DMD as a reprogrammable slit mask. Unfortunately, the protective borosilicate windows limit the use of DMDs in the UV and IR regimes, where the glass has insufficient throughput. In this work, we present our efforts to replace standard DMD windows with custom windows made from UV-grade fused silica, low-absorption optical sapphire (LAOS) and magnesium fluoride (MgF2). We present transmission measurements of the antireflection coated windows and the reflectance of bare (window removed) DMDs. Furthermore, we investigated the long-term stability of the DMD reflectance and experiments for coating DMD active area with a layer of pure aluminum (Al) to boost reflectance performance in the UV spectral range (200−400 nm).

Paper Details

Date Published: 22 July 2016
PDF: 10 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99125V (22 July 2016); doi: 10.1117/12.2233341
Show Author Affiliations
Manuel A. Quijada, NASA Goddard Space Flight Ctr. (United States)
Anton Travinsky, Ctr. for Imaging Science (United States)
Dmitry Vorobiev, Ctr. for Imaging Science (United States)
Zoran Ninkov, Ctr. for Imaging Science (United States)
Alan Raisanen, Rochester Institute of Technology (United States)
Massimo Robberto, Space Telescope Science Institute (United States)
Sara Heap, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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