Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 48, Issue 2, Pages 154-162Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.infrared.2005.09.001
Keywords
wavelength modulation; photoacoustic spectroscopy; trace gas monitoring; DFB lasers
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A theoretical description of photoacoustic spectroscopy generated by wavelength modulation of a semiconductor laser source is reported for a Lorentzian absorption line. This model describes the first- and second-harmonic photoacoustic signals produced by a current-modulated semiconductor laser. Combined intensity- and wavelength-modulation is considered with arbitrary phase shift. Experimental results obtained when probing a CO2 absorption line with a 2-mu m distributed feedback laser are presented and validate the relevance of the reported model. (c) 2005 Elsevier B.V. All rights reserved.
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