1. Wavelength modulation spectroscopy due to unsteady heating of a diode laser active medium
- Author
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I. V. Nikolaev, M. V. Spiridonov, Stepan N Andreev, S. N. Tskhai, S. Yu. Savinov, and Vladimir N Ochkin
- Subjects
Laser diode ,Chemistry ,business.industry ,Optical modulation amplitude ,Laser ,law.invention ,Semiconductor laser theory ,Amplitude modulation ,Optics ,law ,Modulation ,business ,Frequency modulation ,Diode - 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.© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
- Published
- 2006
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