Sensitive trace gas detection with cavity enhanced absorption spectroscopy using a continuous wave external-cavity quantum cascade laser

被引：43

作者：

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

Lang, N. ^{[1
]}

Macherius, U. ^{[1
]}

Zimmermann, H. ^{[1
]}

Roepcke, J. ^{[1
]}

机构：

[1] Leibniz Inst Plasma Sci & Technol INP Greifswald, D-17489 Greifswald, Germany

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 13期

关键词：

OUTPUT SPECTROSCOPY; RING-DOWN;

D O I：

10.1063/1.4823545

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Trace gas sensing in the mid-infrared using quantum cascade lasers (QCLs) promises high specificity and sensitivity. We report on the performance of a simple cavity enhanced absorption spectroscopy (CEAS) sensor using a continuous wave external-cavity QCL at 7.4 mu m. A noise-equivalent absorption coefficient alpha(min) of 2.6 x 10(-8) cm(-1) in 625 s was achieved, which corresponds to a detection limit of 6 +/- 1 ppb of CH4 in 15 millibars air for the R(3) transition at 1327.074 cm(-1). This is the highest value of noise-equivalent absorption and among the longest effective path length (1780 m) reported to date with QCL-based CEAS. (C) 2013 AIP Publishing LLC.

引用

页数：4

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