Wavelength modulation spectroscopy due to unsteady heating of a diode laser active medium

S. N. Andreev; I. V. Nikolaev; V. N. Ochkin; S. Yu. Savinov; M. V. Spiridonov; S. N. Tskhai

doi:10.1117/12.724931

12 December 2006 Wavelength modulation spectroscopy due to unsteady heating of a diode laser active medium

S. N. Andreev, I. V. Nikolaev, V. N. Ochkin, S. Yu. Savinov, M. V. Spiridonov, S. N. Tskhai

Proceedings Volume 6580, 15th Symposium on High-Resolution Molecular Spectroscopy; 65800L (2006) https://doi.org/10.1117/12.724931
Event: 15th Symposium on High-Resolution Molecular Spectroscopy, 2006, Nizhny Novgorod, Russian Federation

Abstract

A special shape of modulation of laser diode injection current is provided when the frequency modulation is not accompanied with amplitude modulation. Such approach permits to suppress essentially the influence of laser emission instabilities. When being applied to gas analysis it gives the possibility of long-term remote components monitoring. The stable relative absorptions of 8xl0^-7 without special calibration are demonstrated. In combination with multipass cell (50 cm between the mirrors, 90 m optical length) it gives the absorption coefficient of l.2x10^-10cm^-1. As an example the daily evolution of atmosphere NO₂ admixtures have been measured with a precision of O.5ppb.

Citation Download Citation

S. N. Andreev, I. V. Nikolaev, V. N. Ochkin, S. Yu. Savinov, M. V. Spiridonov, and S. N. Tskhai "Wavelength modulation spectroscopy due to unsteady heating of a diode laser active medium", Proc. SPIE 6580, 15th Symposium on High-Resolution Molecular Spectroscopy, 65800L (12 December 2006); https://doi.org/10.1117/12.724931

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