12 September 2007 A cryogenic tunable Fabry-Perot interferometer for astronomical observations
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Abstract
The Lockheed Martin - University of Arizona Infrared Spectrometer (LAIRS) is designed to image the emission lines of celestial objects in the 1.3-2.5 μm regime. The Instrument has been built and tested at the Lockheed Martin Space Systems Advanced Technology Center, and demonstrated to work at cryogenic temperatures. The Instrument employs a tunable Fabry-Perot Interferometer (FPI) to select the wavelength at which the Instrument images targets. The FPI employs voice coil actuators and capacitive sensors to maintain parallelism of its reflective lenses and control their gap spacing. During functional tests of the FPI and the LAIRS instrument, finesse numbers of 60 and 24 were measured for the interferometer at room temperature and 80K, respectively. This measurement was performed using a laser operating at 1529.33 nm. This paper presents an overview of the optical, mechanical, and control design of the FPI, as well as a summary of cryogenic test results.
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Jonathan K. Chow, Jonathan K. Chow, Leigh Ann Ryder, Leigh Ann Ryder, Ira Chapman, Ira Chapman, Scott Horner, Scott Horner, Peter D. Dean, Peter D. Dean, } "A cryogenic tunable Fabry-Perot interferometer for astronomical observations", Proc. SPIE 6692, Cryogenic Optical Systems and Instruments XII, 669208 (12 September 2007); doi: 10.1117/12.742100; https://doi.org/10.1117/12.742100
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