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Optical Evaluation of Digital Micromirror Devices (DMDs) with UV-Grade Fused Silica, Sapphire, and Magnesium Fluoride Windows and Longterm Reflectance of Bare DevicesDigital 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 (+/-12deg). 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).
Document ID
20160010355
Document Type
Conference Paper
Authors
Quijada, Manuel A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Travinsky, Anton (Rochester Inst. of Tech. Rochester, NY, United States)
Vorobiev, Dmitry (Rochester Inst. of Tech. Rochester, NY, United States)
Ninkov, Zoran (Rochester Inst. of Tech. Rochester, NY, United States)
Raisanen, Alan (Rochester Inst. of Tech. Rochester, NY, United States)
Robberto, Massimo (Space Telescope Science Inst. Baltimore, MD, United States)
Heap, Sara (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 15, 2016
Publication Date
June 26, 2016
Subject Category
Optics
Report/Patent Number
GSFC-E-DAA-TN34078
Meeting Information
SPIE Astronomical Telescopes -i- Instrumentation(Edinburgh)
Funding Number(s)
CONTRACT_GRANT: NNX14AI62G
CONTRACT_GRANT: NAS5-03127
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
reflectance
transmittance
digital mcromirror array
MOS"
scattering
Galactic Evolution Spectroscopic Explorer
"Digital Micromirror Device
DMD

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