Prospects for machined immersion gratings in the near infrared and visible

Paul J. Kuzmenko

doi:10.1117/12.670519

6 July 2006 Prospects for machined immersion gratings in the near infrared and visible

Paul J. Kuzmenko

Proceedings Volume 6273, Optomechanical Technologies for Astronomy; 62733S (2006) https://doi.org/10.1117/12.670519
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

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.

Citation Download Citation

Paul J. Kuzmenko "Prospects for machined immersion gratings in the near infrared and visible", Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62733S (6 July 2006); https://doi.org/10.1117/12.670519

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