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- E. Serabyn, D. Bendford, S. Wu, and
J. R. Pardo.
"Dual Fabry-Perot Filter for Measurement of CO Rotational Spectra: Design and
Application to the CO Spectrum of Venus"
Applied Optics, 39, 34, 6448-6452 (2000).
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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