Wavelength modulation photoacoustic spectroscopy: Theoretical description and experimental results

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-μm distributed feedback laser are presented and validate the relevance of the reported model. © 2005 Elsevier B.V. All rights reserved.


Published in:
Infrared Physics and Technology, 48, 2, 154-162
Year:
2006
Publisher:
Elsevier
ISSN:
1350-4495
Keywords:
Note:
Ecole Polytechnique Federale de Lausanne (EPFL), Nanophotonics and Metrology Laboratory (NAM), CH-1015 Lausanne, Switzerland Compilation and indexing terms, Copyright 2008 Elsevier Inc. 06219895639 1350-4495 Wavelength modulation Trace gas monitoring Absorption line
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 Record created 2008-09-29, last modified 2018-03-18

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