Modulation spectroscopy with diode lasers: applications in spectroscopy and nonintrusive measurements

Amin N. Dharamsi; Audra Michelle Bullock

doi:10.1117/12.263483

10 January 1997 Modulation spectroscopy with diode lasers: applications in spectroscopy and nonintrusive measurements

Amin N. Dharamsi, Audra Michelle Bullock

Proceedings Volume 3000, Laser Diode and LED Applications III; (1997) https://doi.org/10.1117/12.263483
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

Theoretical and experimental results related to wavelength modulation absorption spectroscopy using single-mode diode lasers are presented. This method uses a phase-sensitive detection technique, and the implications of detection at harmonics greater than the commonly used second-harmonic are discussed. It is shown that several advantages accrue with such higher-harmonic detection. Applications of the method in increasing sensitivity to measurements of density and temperature fluctuations; in increasing wavelength resolution of modulation and pressure broadened congested spectra; and in applications for accurate characterization of absorption lines of molecular spectra, are discussed. It is shown that wing structure of absorption lines can be obtained with much more accuracy using higher harmonic detection than either direct absorption or the commonly used second harmonic detection technique. Experimental results obtained are compared to the predictions of the theory developed.

Citation Download Citation

Amin N. Dharamsi and Audra Michelle Bullock "Modulation spectroscopy with diode lasers: applications in spectroscopy and nonintrusive measurements", Proc. SPIE 3000, Laser Diode and LED Applications III, (10 January 1997); https://doi.org/10.1117/12.263483

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