Wavelength modulation spectroscopy: combined frequency and intensity laser modulation
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A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a Lorentzian absorption line and the effect of several modulation parameters on the detected signals is evaluated, confirming the relevance of the model.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-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.read more
Citations
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Wavelength modulation photoacoustic spectroscopy: Theoretical description and experimental results
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TL;DR: In this paper, a theoretical description of photo-acoustic spectroscopy generated by wavelength modulation of a semiconductor laser source is reported for a Lorentzian absorption line, which describes the first and second-harmonic photoacoustic signals produced by a current-modulated semiconductor lens.
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Quartz─enhanced photoacoustic spectrophones exploiting custom tuning forks: a review
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Compact and portable open-path sensor for simultaneous measurements of atmospheric N2O and CO using a quantum cascade laser.
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TL;DR: In this paper, a power-boosted quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor is developed for sub-ppm H2S trace-gas detection in the near-infrared spectral region.
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