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Application of antimonide lasers for gas sensing in the 3-4-mu m range

: Werle, P.; Popov, A.


Applied optics 38 (1999), Nr.9, S.1494-1501 : Ill., Lit.
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert

Antimonide semiconductor laser devices designed for continuous-wave emission in the 3-4-mu m spectral range have been investigated with respect to spectroscopic applications. Representative data on the mode structure, output power, noise characteristics, far-field pattern, and modulation response are presented. Selected laser devices have been applied for methane (CH4) and formaldehyde (HCHO) measurements by use of a high-frequency modulated diode laser spectrometer. From an Allan variance analysis of experimental data a detection limit for HCHO of 120 pptv (where 1 pptv = 10(exp -12) volume mixing ratio) with a 40-s integration time and for CH4 of 2 ppbv (where 1 ppbv = 10(exp -9) volume mixing ratio) with 20-s integration time were determined. The results show that, for selected gases, InAsSb lasers can be an alternative to lead-salt diode lasers.