QEPAS based detection of broadband absorbing molecules using a widely tunable, cw quantum cascade laser at 8.4 μm

被引：99

作者：

Lewicki, Rafal ^{[1
]}

Wysocki, Gerard ^{[1
]}

Kosterev, Anatoliy A. ^{[1
]}

Tittel, Frank. K. ^{[1
]}

机构：

[1] Rice Univ, Rice Quantum Inst, Houston, TX 77005 USA

来源：

OPTICS EXPRESS | 2007年 / 15卷 / 12期

关键词：

D O I：

10.1364/OE.15.007357

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Detection of molecules with wide unresolved rotational-vibrational absorption bands is demonstrated by using Quartz Enhanced Photoacoustic Spectroscopy and an amplitude modulated, high power, thermoelectrically cooled quantum cascade laser operating at 8.4 mu m in an external cavity configuration. The laser source exhibits single frequency tuning of 135 cm(-1) with a maximum optical output power of 50 mW. For trace-gas detection of Freon 125 (pentafluoroethane) at 1208.62 cm(-1) a normalized noise equivalent absorption coefficient of NNEA = 2.64 x 10(-9) cm(-1) center dot W/Hz(1/2) was obtained. Noise equivalent sensitivity at ppbv level as well as spectroscopic chemical analysis of a mixture of two broadband absorbers (Freon 125 and acetone) with overlapping absorption spectra were demonstrated. (c) 2007 Optical Society of America.

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收藏

页码：7357 / 7366

页数：10

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