23 June 1994 Cryogenic servo-stabilized Fabry-Perot interferometers for the 3- to 5-μm-wavelength region
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Abstract
A cooled Fabry-Perot interferometer system is described in which the mirror parallelism is servo-stabilized and the mirror spacing is electronically tuned using an existing commercially available etalon control system. Capacitance sensors monitor the mirror spacing at points around the periphery, and piezoelectric actuators are used to tune the mirror spacing. The etalon operates at liquid nitrogen temperature. It has a clear aperture of 50 mm and a nominal mirror spacing of between 5 and 60 microns. It is coated for the 3 - 5 micrometers spectral region, although coatings are also available for the 2 - 2.5 micrometers and 9 - 13 micrometers regions. Under servo-control at operating temperature the etalon has a response time of 30 msec and a minimum cavity tuning range of +/- 3 micrometers about the nominal cavity length, corresponding to approximately 3 orders of interference at the midrange wavelength of 4 micrometers .
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Newrick K. Reay, Krzysztof A.R.B. Pietraszewski, "Cryogenic servo-stabilized Fabry-Perot interferometers for the 3- to 5-μm-wavelength region", Proc. SPIE 2227, Cryogenic Optical Systems and Instruments VI, (23 June 1994); doi: 10.1117/12.178616; https://doi.org/10.1117/12.178616
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KEYWORDS
Mirrors

Fabry–Perot interferometry

Cryogenics

Fabry–Perot interferometers

Actuators

Capacitance

Control systems

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