Echelle gratings for the near-infrared

Kenneth H. Hinkle; Richard R. Joyce; Bernhard W. Bach; Erich Bach; Kirk G. Bach; Brooke M. Beam; Gary Poczulp; Verne V. Smith; Lloyd Wallace

doi:10.1117/12.925476

24 September 2012 Echelle gratings for the near-infrared

Kenneth H. Hinkle, Richard R. Joyce, Bernhard W. Bach, Erich Bach, Kirk G. Bach, Brooke M. Beam, Gary Poczulp, Verne V. Smith, Lloyd Wallace

Author Affiliations +

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84463B (2012) https://doi.org/10.1117/12.925476
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

We report on echelle gratings produced by diamond turning with groove spacings coarser than 20 lines per mm. Increasing the groove spacing of an echelle reduces the free spectral range allowing infrared orders to be matched to the detector size. Reflection echelle gratings designed for the near-infrared have potential wide application in both ambient temperature as well as cryogenic astronomical spectrographs. Diamond turned reflection echelle gratings are currently employed in space-based high-resolution spectrographs for 2 – 4 μm planetary spectroscopy. Using a sample diamond turned grating we investigate the suitability of a 15 line/mm R3 echelle for use in ground-based 1 – 5 μm spectroscopy. We find this grating suitable for 3 – 5 μm high signal-to-noise, high-resolution applications. Controlling wavefront errors by an additional factor of two would permit use at high-resolution in the 1.5 – 2.5 μm region.

Citation Download Citation

Kenneth H. Hinkle, Richard R. Joyce, Bernhard W. Bach, Erich Bach, Kirk G. Bach, Brooke M. Beam, Gary Poczulp, Verne V. Smith, and Lloyd Wallace "Echelle gratings for the near-infrared", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84463B (24 September 2012); https://doi.org/10.1117/12.925476

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