Dual Fabry-Perot filter for measurement of CO rotational spectra: design and application to the CO spectrum of Venus
- Creators
- Serabyn, E.
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Benford, D. J.
- Wu, S.
- Pardo, J. R.
Abstract
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.
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.Attached Files
Published - SERao00.pdf
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Additional details
- Eprint ID
- 5949
- Resolver ID
- CaltechAUTHORS:SERao00
- Created
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2006-11-09Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field