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Proceedings Paper

Development of a large mosaic volume phase holographic (VPH) grating for APOGEE
Author(s): James Arns; John C. Wilson; Mike Skrutskie; Steve Smee; Robert Barkhouser; Daniel Eisenstein; Jim Gunn; Fred Hearty; Al Harding; Paul Maseman; Jon Holtzman; Ricardo Schiavon; Bruce Gillespie; Steven Majewski
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Paper Abstract

Volume phase holographic (VPH) gratings are increasingly being used as diffractive elements in astronomical instruments due to their potential for very high peak diffraction efficiencies and the possibility of a compact instrument design when the gratings are used in transmission. Historically, VPH grating (VPHG) sizes have been limited by the size of manufacturer's holographic recording optics. We report on the design, specification and fabrication of a large, 290 mm × 475 mm elliptically-shaped, mosaic VPHG for the Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectrograph. This high-resolution near-infrared multi-object spectrograph is in construction for the Sloan Digital Sky Survey III (SDSS III). The 1008.6 lines/mm VPHG was designed for optimized performance over a wavelength range from 1.5 to 1.7 μm. A step-and-repeat exposure method was chosen to fabricate a three-segment mosaic on a 305 mm × 508 mm monolithic fused-silica substrate. Specification considerations imposed on the VPHG to assure the mosaic construction will satisfy the end use requirements are discussed. Production issues and test results of the mosaic VPHG are discussed.

Paper Details

Date Published: 19 July 2010
PDF: 12 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 773913 (19 July 2010); doi: 10.1117/12.857623
Show Author Affiliations
James Arns, Kaiser Optical Systems, Inc. (United States)
John C. Wilson, Univ. of Virginia (United States)
Mike Skrutskie, Univ. of Virginia (United States)
Steve Smee, The Johns Hopkins Univ. (United States)
Robert Barkhouser, The Johns Hopkins Univ. (United States)
Daniel Eisenstein, Steward Observatory, The Univ. of Arizona (United States)
Jim Gunn, Princeton Univ. (United States)
Fred Hearty, Univ. of Virginia (United States)
Al Harding, The Johns Hopkins Univ. (United States)
Paul Maseman, Univ. of Virginia (United States)
Jon Holtzman, New Mexico State Univ. (United States)
Ricardo Schiavon, Gemini Observatory (United States)
Bruce Gillespie, Apache Point Observatory (United States)
Steven Majewski, Univ. of Virginia (United States)


Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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