Wavelength modulation spectroscopy: combined frequency and intensity laser modulation

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


Published in:
Applied Optics, 42, 33, 6728-38
Year:
2003
Publisher:
Optical Society of America
ISSN:
0003-6935
Keywords:
Note:
Lab. of Metrol. & Photonics, Ecole Polytech. Fed. de Lausanne, Switzerland, Copyright 2004, IEE, 7923187, 0003-6935, wavelength modulation spectroscopy, laser diode, Lorentzian absorption line, current-modulated semiconductor laser, intensity modulation, frequency modulation, arbitrary phase shift, modulation parameters, CO2 absorption line, distributed-feedback laser, 2 mum, CO2
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 Record created 2008-09-29, last modified 2018-03-18

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