Characterization of fiber-laser-based sub-Doppler NICE-OHMS for quantitative trace gas detection

被引：41
作者：
Foltynowicz, Aleksandra [1 ]
Ma, Weiguang [1 ]
Axner, Ove [1 ]
机构：
[1] Umea Univ, Dept Phys, SE-90187 Umea, Sweden
来源：
OPTICS EXPRESS | 2008年 / 16卷 / 19期
基金：
瑞典研究理事会;
关键词：
D O I：
10.1364/OE.16.014689
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The potential of fiber-laser-based sub-Doppler noise-immune cavity-enhanced optical heterodyne molecular spectrometry for trace gas detection is scrutinized. The non-linear dependence of the on-resonance sub-Doppler dispersion signal on the intracavity pressure and power is investigated and the optimum conditions with respect to these are determined. The linearity of the signal strength with concentration is demonstrated and the dynamic range of the technique is discussed. Measurements were performed on C2H2 at 1531 nm up to degrees of saturation of 100. The minimum detectable sub-Doppler optical phase shift was 5 x 10(-11) cm(-1) Hz(-1/2), corresponding to a partial pressure of C2H2 of 1 x 10(-12) atm for an intracavity pressure of 20 mTorr, and a concentration of 10 ppb at 400 mTorr. (C) 2008 Optical Society of America.
引用
收藏
页码：14689 / 14702
页数：14
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