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Proceedings Paper

Cryogenic servo-stabilized Fabry-Perot interferometer for imaging at 2-2.5 microns
Author(s): Krzysztof A.R.B. Pietraszewski; Adrian G. Meldrum
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Paper Abstract

A cryogenically cooled Fabry-Perot etalon for imaging in the 2-2.5 micrometers , K band, spectral region has been constructed. Capacitance sensors monitor the etalon mirror spacing and parallelism and provide the error signals for active cavity control in a feedback loop with piezoelectric actuators. The new K band etalon is designed to be compatible with the Queensgate Instruments Ltd. CS100/ET servo-stabilized Fabry- Perot system. 3-5 micrometers cryogenically cooled etalons have also been made and coatings are also available for the 8-13 micrometers range. Working in the K band range permits the use of water free silica substrates which in turn allows the cavity spacing to be extended beyond the nominal 100 micrometers cavity spacing of the 3-5 micrometers etalons by using specially manufactured optically contacted capacitor pads. Under servo-control at 77K the etalon has a response time of 30ms and a minimum cavity tuning range of +/- 3 micrometers about the nominal cavity length, corresponding to at least 5 orders of interference at a wavelength of 2.5 micrometers . The etalon aperture has a nominal diameter of 50mm.

Paper Details

Date Published: 14 October 1996
PDF: 8 pages
Proc. SPIE 2814, Cryogenic Optical Systems and Instruments VII, (14 October 1996); doi: 10.1117/12.254136
Show Author Affiliations
Krzysztof A.R.B. Pietraszewski, Queensgate Instruments Ltd. (United Kingdom)
Adrian G. Meldrum, Queensgate Instruments Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 2814:
Cryogenic Optical Systems and Instruments VII
Lawrence G. Burriesci; James B. Heaney, Editor(s)

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