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

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

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2814..139p&link_type=abstract

Proc. SPIE Vol. 2814, p. 139-146, Cryogenic Optical Systems and Instruments VII, Lawrence G. Burriesci; James B. Heaney; Eds.

Computer Science

Scientific paper

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.

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