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Proceedings Paper

High efficiency germanium immersion gratings
Author(s): Paul J. Kuzmenko; Pete J. Davis; Steve L. Little; Liesl M. Little; Jay V. Bixler
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Paper Abstract

We have fabricated several germanium immersion gratings by single crystal, single point diamond flycutting on an ultra-precision lathe. Use of a dead sharp tool produces groove corners less than 0.1 micron in radius and consequently high diffraction efficiency. We measured first order efficiencies in immersion of over 80% at 10.6 micron wavelength. Wavefront error was low averaging 0.06 wave rms (at 633 nm) across the full aperture. The grating spectral response was free of ghosts down to our detection limit of 1 part in 104. Scatter should be low based upon the surface roughness. Measurement of the spectral line profile of a CO2 laser sets an upper bound on total integrated scatter of 0.5%.

Paper Details

Date Published: 6 July 2006
PDF: 14 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62733T (6 July 2006); doi: 10.1117/12.670565
Show Author Affiliations
Paul J. Kuzmenko, Lawrence Livermore National Lab. (United States)
Pete J. Davis, Lawrence Livermore National Lab. (United States)
Steve L. Little, Lawrence Livermore National Lab. (United States)
Liesl M. Little, Lawrence Livermore National Lab. (United States)
Jay V. Bixler, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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