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Improved sensitivity of intensity-modulated spectroscopy using correlative signal processing |
Optics Letters, Vol. 36, Issue 3, pp. 346-348 (2011)
http://dx.doi.org/10.1364/OL.36.000346
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Abstract
Frequency-modulation (FM) spectroscopy is known to be a sensitive spectroscopic technique capable of accurately measuring the frequency dependence of the absorption and index of refraction of narrow spectral features. The absorption and index of refraction are coupled by a form of the Kramers–Kronig (K-K) relations, and both components provide information about the spectral feature. In this Letter, we propose a processing technique based on fitting the data to a complex signal model derived from the K-K relation. By using this complex constraint and only processing a single quadrature, our model predicts significant improvement in the minimum detectable absorption compared with conventional FM spectroscopy.
© 2011 Optical Society of America
OCIS Codes
(020.3690) Atomic and molecular physics : Line shapes and shifts
(300.6360) Spectroscopy : Spectroscopy, laser
(300.6380) Spectroscopy : Spectroscopy, modulation
ToC Category:
Spectroscopy
History
Original Manuscript: October 14, 2010
Manuscript Accepted: December 20, 2010
Published: January 25, 2011
Citation
Vahid Ataie and George Papen, "Improved sensitivity of intensity-modulated spectroscopy using correlative signal processing," Opt. Lett. 36, 346-348 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-3-346
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