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Dual Fabry-Perot filter for measurement of CO rotational spectra: design and application to the CO spectrum of Venus

Serabyn, E. and Benford, D. J. and Wu, S. and Pardo, J. R. (2000) Dual Fabry-Perot filter for measurement of CO rotational spectra: design and application to the CO spectrum of Venus. Applied Optics, 39 (34). pp. 6448-6452. ISSN 0003-6935. doi:10.1364/AO.39.006448.

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We present the design of a harmonic resonant filter that can be used with a Fourier transform spectrometer (FTS) for simultaneous measurement of a series of lines in the CO rotational ladder. To enable studies of both broad CO absorptions in Venus and modestly red-shifted CO emission from external galaxies, relatively broad (approximately 10-30-GHz FWHM) transmission passbands are desirable. Because a single low-finesse Fabry Perot (FP) etalon has insufficient interline rejection, a dual-FP etalon was considered. Such a design provides significantly better interband rejection and somewhat more flattopped transmission spikes. A prototype filter of this type, made of two thin silicon disks spaced by an air gap, has been constructed and used with our FTS at the Caltech Submillimeter Observatory for simultaneous measurement of the four submillimeter CO transitions in the atmosphere of Venus that are accessible from the ground.

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Benford, D. J.0000-0002-9884-4206
Additional Information:© 2000 Optical Society of America. Received 25 January 2000; revised manuscript received 16 August 2000. This study was supported by NASA grant NAG5-6816. We thank G.R. Rossman for the use of his FTS and Y.C. Tai for access to etching facilities.
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Subject Keywords:Fabry-Perot gratings; Spectroscopy, far infrared; Fourier transforms spectroscopy; Astronomical instruments
Issue or Number:34
Record Number:CaltechAUTHORS:SERao00
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5949
Deposited By: Lindsay Cleary
Deposited On:09 Nov 2006
Last Modified:08 Nov 2021 20:30

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