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Proceedings Paper

Fabrication and testing of germanium grisms for LMIRcam
Author(s): Paul J. Kuzmenko; Steve L. Little; Liesl M. Little; John C. Wilson; Michael F. Skrutskie; Philip M. Hinz; Jarron M. Leisenring; Olivier Durney
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Paper Abstract

We diamond fly cut 2 sets of germanium grisms for the LMIRcam 3-5 micron Fizeau imager for the combined focus of the Large Binocular Telescope (LBT). The grisms mount in a filter wheel near a pupil to enable moderate resolution (R~300) spectroscopy. Both sets have a measured blaze angle of 2.9°. The first set has a groove period of 40 lines/mm and will be used in first order with peak efficiency at 3.6 μm. The second set has 32 lines/mm. It can operate in first order with an efficiency peak near 4.4 μm and in second order with a peak near 2.3 μm. First results from testing the grisms in the instrument on the sky with the LBT are presented.

Paper Details

Date Published: 13 September 2012
PDF: 12 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84503P (13 September 2012); doi: 10.1117/12.926674
Show Author Affiliations
Paul J. Kuzmenko, Lawrence Livermore National Lab. (United States)
Steve L. Little, Lawrence Livermore National Lab. (United States)
Liesl M. Little, Lawrence Livermore National Lab. (United States)
John C. Wilson, Univ. of Virginia (United States)
Michael F. Skrutskie, Univ. of Virginia (United States)
Philip M. Hinz, Steward Observatory, The Univ. of Arizona (United States)
Jarron M. Leisenring, ETH Zurich (Switzerland)
Olivier Durney, Steward Observatory, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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