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Proceedings Paper

Volume phase holographic (VPH) grisms for optical and infrared spectrographs
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Paper Abstract

Highly efficient Volume phase holographic (VPH) gratings do not lend themselves to use in existing spectrographs except for grism spectrographs where VPH grisms can be designed that disperse but do not deviate the light. We discuss our program to outfit existing spectrographs [the Imaging grism instrument (IGI) on the McDonald Observatory Smith Reflector, and the Hobby-Eberly Telescope Marcario Low Resolution Spectrograph (LRS)] with efficient VPH grisms. We present test data on sample gratings from Ralcon Development Lab, and compare them to theoretical predictions. We have created a simple test bench for efficiency measurements of VPH gratings, which we describe. Finally we present first results from the use of VPH grisms in IGI and the LRS, the latter being the largest grism ever deployed in an astronomical spectrograph. We also look forward to using VPH grisms in the LRS infrared extension, which covers the wavelength range from 0.9 to 1.3 microns.

Paper Details

Date Published: 30 January 2003
PDF: 9 pages
Proc. SPIE 4842, Specialized Optical Developments in Astronomy, (30 January 2003); doi: 10.1117/12.458103
Show Author Affiliations
Gary J. Hill, McDonald Observatory/Univ. of Texas at Austin (United States)
Marsha J. Wolf, Univ. of Texas at Austin (United States)
Joseph R. Tufts, Univ. of Texas at Austin (United States)
Erin C. Smith, Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 4842:
Specialized Optical Developments in Astronomy
Eli Atad-Ettedgui; Sandro D'Odorico, Editor(s)

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