Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6273e.117k&link_type=abstract
Optomechanical Technologies for Astronomy. Edited by Atad-Ettedgui, Eli; Antebi, Joseph; Lemke, Dietrich. Proceedings of the S
Astronomy and Astrophysics
Astronomy
2
Scientific paper
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.
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