A Cooled Optically Servo-Controlled Infrared Fabry-Perot Spectrometer

Eric R Wollman; Frank E Stuart; Howard A Smith; William B Waltman

doi:10.1117/12.966118

9 January 1984 A Cooled Optically Servo-Controlled Infrared Fabry-Perot Spectrometer

Eric R Wollman, Frank E Stuart, Howard A Smith, William B Waltman

Proceedings Volume 0445, Instrumentation in Astronomy V; (1984) https://doi.org/10.1117/12.966118
Event: 1983 Astronomy Conferences, 1983, London, United Kingdom

Abstract

A cooled optically servo-controlled infrared Fabry-Perot spectrometer has been constructed. The control system maintains both alignment and spacing of a tunable infrared etalon. An annular portion of the IR etalon is coated for control use at visible wavelengths. Correct spacing is determined by reference to an associated visible etalon of fixed and slightly different spacing. The spacing of the IR etalon then varies approximately linearly with the output wavelength of a visible control monochromator. The full range of the mono-chromator, typically 500 to 700 nm, corresponds to a change in etalon spacing which can be as little as a small fraction of an IR order or as much as several orders. The movable plate of the IR etalon is positioned by an electromagnetic drive system with a mechanical range of about a millimeter. The instrument is planned to accommodate up to three IR etalons which can be scanned synchronously by tuning the output of a single control mono-chromator. A single-etalon version of the spectrometer has been operated at the Cassegrain focus of the KPNO 1.3m telescope.

Citation Download Citation

Eric R Wollman, Frank E Stuart, Howard A Smith, and William B Waltman "A Cooled Optically Servo-Controlled Infrared Fabry-Perot Spectrometer", Proc. SPIE 0445, Instrumentation in Astronomy V, (9 January 1984); https://doi.org/10.1117/12.966118

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KEYWORDS

Fabry–Perot interferometers

Monochromators

Servomechanisms

Spectroscopy

Telescopes

Infrared spectroscopy

Photometry

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