Cryogenic servo-stabilized Fabry-Perot interferometer for imaging at 2-2.5 microns

Krzysztof A.R.B. Pietraszewski; Adrian G. Meldrum

doi:10.1117/12.254136

14 October 1996 Cryogenic servo-stabilized Fabry-Perot interferometer for imaging at 2-2.5 microns

Krzysztof A.R.B. Pietraszewski, Adrian G. Meldrum

Proceedings Volume 2814, Cryogenic Optical Systems and Instruments VII; (1996) https://doi.org/10.1117/12.254136
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

Citation Download Citation

Krzysztof A.R.B. Pietraszewski and Adrian G. Meldrum "Cryogenic servo-stabilized Fabry-Perot interferometer for imaging at 2-2.5 microns", Proc. SPIE 2814, Cryogenic Optical Systems and Instruments VII, (14 October 1996); https://doi.org/10.1117/12.254136

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