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10 July 2018 Testing of a germanium immersion grating
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Germanium Immersion Gratings (GIGs) may be an important component for a compact, high-resolution spectrograph for the infrared. Germanium’s large index of refraction reduces the length of the grating by a factor of four compared to conventional reflection gratings. Germanium transmits light from roughly 2 to 11.5 μm, which includes spectral regions largely unavailable from the ground because of molecules in Earth’s atmosphere. This combination makes GIGs a compelling technology for space missions focused on molecules in astrophysical environments. We are beginning testing of a GIG supplied by Canon, Inc., and anticipate eventual detailed testing of the Canon grating and a similar GIG supplied by LLNL. We also discuss potential science observations that demonstrate the significance of high-resolution, infrared spectroscopy from space.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew J. Richter, Peter T. Zell, Jeffrey S. Logan, Robert E. McMurray, Curtis N. DeWitt, Karl W. Kaess, Isaiah B. Santistevan, Edward J. Montiel, Adwin Boogert, Thomas P. Greene, Scott A. Sandford, Takashi Sukagawa, and Paul J. Kuzmenko "Testing of a germanium immersion grating", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070652 (10 July 2018);

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