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Proceedings Paper

Sensitive absorption-line characterization and Fabry-Perot fringing reduction in modulation spectroscopy
Author(s): Amin N. Dharamsi; Audra Michelle Bullock; Patrick C. Shea
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Paper Abstract

Theoretical and experimental results are presented to show that the etaloning problem in wavelength modulation experiments can be overcome by using harmonic detection that is greater than the commonly used second. The conditions under which such an advantage is obtained are discussed. Since the fringes due to parasitic Fabry-Perot etalons often place a limit to the ultimate sensitivity of such experiments, the method discussed has applications wherever sensitivity has to be increased. The method of higher harmonic detection is an alternative to synchronous mechanical jittering of an offending optical element that has been used in the past to average out the fringes.

Paper Details

Date Published: 27 May 1998
PDF: 9 pages
Proc. SPIE 3265, Solid State Lasers VII, (27 May 1998); doi: 10.1117/12.308670
Show Author Affiliations
Amin N. Dharamsi, Old Dominion Univ. (United States)
Audra Michelle Bullock, Old Dominion Univ. (United States)
Patrick C. Shea, Old Dominion Univ. (United States)

Published in SPIE Proceedings Vol. 3265:
Solid State Lasers VII
Richard Scheps, Editor(s)

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