Sensitive amplitude-and phase-modulated absorption-spectroscopy with a continuously tunable diode laser
| Autor: | R. Großkloß, W. Demtröder, P. Kersten |
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| Rok vydání: | 1994 |
| Předmět: |
Tunable diode laser absorption spectroscopy
Materials science Physics and Astronomy (miscellaneous) Absorption spectroscopy business.industry Overtone General Engineering General Physics and Astronomy Laser law.invention Amplitude modulation Optics law Attenuation coefficient business Phase modulation Tunable laser |
| Zdroj: | Applied Physics B Laser and Optics. 58:137-142 |
| ISSN: | 1432-0649 0946-2171 |
| DOI: | 10.1007/bf01082348 |
| Popis: | The output beam of a continuously tunable GaA1As-diode laser with external cavity is phase-modulated at 800 MHz in an electrooptic LiTaO3 crystal. The amplitude of the rf voltage applied to the EOM is modulated at 80 kHz in order to allow lock-in detection. Using a multipass absorption cell the detection limit of the absorption coefficient α could be pushed down to αmin ≧2 × 10−10 cm2212;1. The sensitivity of the techique is demonstrated by examples of overtone transitions in C2H2 and H2O vapor. |
| Databáze: | OpenAIRE |
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