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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 33 — Nov. 20, 2003
  • pp: 6728–6738

Wavelength modulation spectroscopy: combined frequency and intensity laser modulation

Stéphane Schilt, Luc Thévenaz, and Philippe Robert  »View Author Affiliations


Applied Optics, Vol. 42, Issue 33, pp. 6728-6738 (2003)
http://dx.doi.org/10.1364/AO.42.006728


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Abstract

A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a Lorentzian absorption line is presented. This theory describes the general case of a current-modulated semiconductor laser, for which a combined intensity and frequency modulation with an arbitrary phase shift occurs. On the basis of this model, the effect of several modulation parameters on the detected signals is evaluated. Experimental signals measured on an absorption line of CO2 by use of a 2-μm distributed-feedback laser are also presented and validate this analysis. These experimental results agree with the calculated signals, confirming the relevance of the model.

© 2003 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6380) Spectroscopy : Spectroscopy, modulation

History
Original Manuscript: February 6, 2003
Revised Manuscript: July 5, 2003
Published: November 20, 2003

Citation
Stéphane Schilt, Luc Thévenaz, and Philippe Robert, "Wavelength modulation spectroscopy: combined frequency and intensity laser modulation," Appl. Opt. 42, 6728-6738 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-33-6728


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