SENSITIVE AMPLITUDE-MODULATED AND PHASE-MODULATED ABSORPTION-SPECTROSCOPY WITH A CONTINUOUSLY TUNABLE DIODE-LASER

Authors
GROSSKLOSS R KERSTEN P DEMTRODER W
Citation
R. Grosskloss et al., SENSITIVE AMPLITUDE-MODULATED AND PHASE-MODULATED ABSORPTION-SPECTROSCOPY WITH A CONTINUOUSLY TUNABLE DIODE-LASER, Applied physics. B, Lasers and optics, 58(2), 1994, pp. 137-142
Citations number
17
Categorie Soggetti
Physics, Applied",Optics
Journal title
Applied physics. B, Lasers and optics → ACNP
ISSN journal
09462171
Volume
58
Issue
2
Year of publication
1994
Pages
137 - 142
Database
ISI
SICI code
0946-2171(1994)58:2<137:SAAPA>2.0.ZU;2-V
Abstract
The output beam of a continuously tunable GaAlAs-diode laser with exte rnal cavity is phase-modulated at 800 MHz in an electrooptic LiTaO3 cr ystal. 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 abso rption cell the detection limit of the absorption coefficient a could be pushed down to alpha(min) greater-than-or-equal-to 2 x 10(-10) cm-1 . The sensitivity of the techique is demonstrated by examples of overt one transitions in C2H2 and H2O vapor.