Sensitive CH4 detection applying quantum cascade laser based optical feedback cavity-enhanced absorption spectroscopy

被引：36

作者：

Lang, N. ^{[1
]}

Macherius, U. ^{[1
]}

Wiese, M. ^{[1
]}

Zimmermann, H. ^{[1
]}

Roepcke, J. ^{[1
]}

van Helden, J. H. ^{[1
]}

机构：

[1] Leibniz Inst Plasma Sci & Technol, F Hausdorff Str 2, D-17489 Greifswald, Germany

来源：

OPTICS EXPRESS | 2016年 / 24卷 / 06期

关键词：

DIODE-LASER; SPECTROMETER; NOISE;

D O I：

10.1364/OE.24.00A536

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on sensitive detection of atmospheric methane employing quantum cascade laser based optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS). An instrument has been built utilizing a continuous-wave distributed feedback quantum cascade laser (cw-QCL) with a V-shaped cavity, a common arrangement that reduces feedback to the laser from non-resonant reflections. The spectrometer has a noise equivalent absorption coefficient of 3.6 x 10(-9) cm(-1) Hz(-1/2) for a spectral scan of CH4 at 7.39 mu m. From an Allan-Werle analysis a detection limit of 39 parts per trillion of CH4 at atmospheric pressure within 50 s acquisition time was found. (C) 2016 Optical Society of America

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页码：A536 / A543

页数：8

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