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

被引：47

作者：

Werle, P

Popov, A

机构：

[1] Fraunhofer Inst, D-82467 Garmisch Partenkirchen, Germany

[2] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

来源：

APPLIED OPTICS | 1999年 / 38卷 / 09期

关键词：

D O I：

10.1364/AO.38.001494

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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(-12) volume mixing ratio) with a 40-s integration time and for CH4 of 2 ppbv (where 1 ppbv = 10(-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. (C) 1999 Optical Society of America.

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页码：1494 / 1501

页数：8

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