Share Email Print

Proceedings Paper

Mass production of volume phase holographic gratings for the VIRUS spectrograph array
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

The Visible Integral-field Replicable Unit Spectrograph (VIRUS) is a baseline array of 150 copies of a simple, fiber-fed integral field spectrograph that will be deployed on the Hobby-Eberly Telescope (HET). VIRUS is the first optical astronomical instrument to be replicated on an industrial scale, and represents a relatively inexpensive solution for carrying out large-area spectroscopic surveys, such as the HET Dark Energy Experiment (HETDEX). Each spectrograph contains a volume phase holographic (VPH) grating with a 138 mm diameter clear aperture as its dispersing element. The instrument utilizes the grating in first-order for 350 < λ (nm) < 550. Including witness samples, a suite of 170 VPH gratings has been mass produced for VIRUS. Here, we present the design of the VIRUS VPH gratings and a discussion of their mass production. We additionally present the design and functionality of a custom apparatus that has been used to rapidly test the first-order diffraction efficiency of the gratings for various discrete wavelengths within the VIRUS spectral range. This device has been used to perform both in-situ tests to monitor the effects of adjustments to the production prescription as well as to carry out the final acceptance tests of the gratings' diffraction efficiency. Finally, we present the as-built performance results for the entire suite of VPH gratings.

Paper Details

Date Published: 7 August 2014
PDF: 16 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91511J (7 August 2014); doi: 10.1117/12.2056053
Show Author Affiliations
Taylor S. Chonis, The Univ. of Texas at Austin (United States)
Amy Frantz, Syzygy Optics, LLC (United States)
Gary J. Hill, The Univ. of Texas at Austin (United States)
McDonald Observatory (United States)
J. Christopher Clemens, Syzygy Optics, LLC (United States)
The Univ. of North Carolina at Chapel Hill (United States)
Hanshin Lee, McDonald Observatory, The Univ. of Texas at Austin (United States)
Sarah E. Tuttle, McDonald Observatory, The Univ. of Texas at Austin (United States)
Joshua J. Adams, Carnegie Observatories (United States)
J. L. Marshall, Texas A&M Univ. (United States)
D. L. DePoy, Texas A&M Univ. (United States)
Travis Prochaska, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?