Wavelength modulation spectroscopy: combined frequency and intensity laser modulation

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 occ...

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Veröffentlicht in:Applied Optics 2003-11, Vol.42 (33), p.6728-6738
Hauptverfasser: Schilt, Stéphane, Thévenaz, Luc, Robert, Philippe
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container_title Applied Optics
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creator Schilt, Stéphane
Thévenaz, Luc
Robert, Philippe
description 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-microm distributed-feedback laser are also presented and validate this analysis. These experimental results agree with the calculated signals, confirming the relevance of the model.
doi_str_mv 10.1364/ao.42.006728
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title Wavelength modulation spectroscopy: combined frequency and intensity laser modulation
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