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Optical Engineering

Cryogenic Servo-Controlled Infrared Fabry-Perot Spectrometer
Author(s): Howard A. Smith; Jacqueline Fischer; William B. Waltman; Ray W. Russell; Eric R. Wollman; Elise Albert; Frank E. Stuart
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Paper Abstract

High resolution infrared spectroscopy obtains fundamental information about the kinematics, composition, and energetics of astronomical infrared sources because it can sort out typical Doppler velocity components and separate adjacent lines from various species. In important cases the instrument having the maximum possible sensitivity for detection is a cryogenic Fabry-Perot spectrometer because it rejects noise from the bright and often flickering background without injecting any radiation. Such an instrument need only be limited by the performance of the best detectors. Coupled to a two-dimensional array, a cryogenic Fabry-Perot can produce spectroscopic infrared images of high quality. We have developed a prototype cryogenic infrared Fabry-Perot spectrometer and have operated it successfully on-site. The system uses a unique optical servo control for reliable sensing of the interferometric surfaces, and electromagnetic voice coil displacement drivers for the large motions needed for flexible operation. The present etalons and detector are optimized for the 4 to 5 Am band. We present a description of the instrument, recent astro-physical results obtained at a telescope, and a summary of development plans. Such a system can be operated from space out to submillimeter wavelengths.

Paper Details

Date Published: 1 April 1985
PDF: 10 pages
Opt. Eng. 24(2) 242275 doi: 10.1117/12.7973469
Published in: Optical Engineering Volume 24, Issue 2
Show Author Affiliations
Howard A. Smith, Naval Research Laboratory (United States)
Jacqueline Fischer, Naval Research Laboratory (United States)
William B. Waltman, Naval Research Laboratory (United States)
Ray W. Russell, The Aerospace Corporation (United States)
Eric R. Wollman, Bates College (United States)
Elise Albert, U.S. Naval Academy (United States)
Frank E. Stuart, Kitt Peak National Observatory (United States)

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