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Proceedings Paper

Prospects for machined immersion gratings in the near infrared and visible
Author(s): Paul J. Kuzmenko
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Paper Abstract

Immersion gratings machined in germanium have demonstrated excellent performance in the 8 to 13 μm band. The machining precision is adequate for use down 2μm, the short wavelength limit of germanium. Materials exist (Si, GaAs, GaP, ZnSe and ZnS) that could enable gratings to be made for near infrared and visible wavelengths. Work needs to be done to determine the optimal machining conditions. Commercial forms of these materials are optimized for other applications and may need some development to improve their performance at the shortest wavelengths. Current machining precision is adequate in most aspects. The surface figure of the groove facets (i.e. wavefront error) would need just over a factor of 2 improvement at the shortest wavelengths to maintain diffraction limited performance. The tolerance in random groove position error may be the most difficult to achieve.

Paper Details

Date Published: 6 July 2006
PDF: 7 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62733S (6 July 2006); doi: 10.1117/12.670519
Show Author Affiliations
Paul J. Kuzmenko, 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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