Sensitive absorption measurements in the near-infrared region using off-axis integrated-cavity-output spectroscopy

被引：345

作者：

Baer, DS ^{[1
]}

Paul, JB ^{[1
]}

Gupta, JB ^{[1
]}

O'Keefe, A ^{[1
]}

机构：

[1] Los Gatos Res, Mountain View, CA 94041 USA

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2002年 / 75卷 / 2-3期

关键词：

D O I：

10.1007/s00340-002-0971-z

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel instrument that employs a high-finesse optical cavity as an absorption cell has been developed for sensitive measurements of gas mixing ratios using near-in rare diode lasers and absorption-spectroscopy techniques. The instrument employs an off-axis trajectory of the laser beam through the cell to yield an effective optical path length of several kilometers without significant unwanted effects due to cavity resonances. As a result, a minimum detectable absorption of approximately 1.4 x 10(-5) over an effective optical path of 4.2km was obtained in a 1.1-Hz detection bandwidth to yield a detection sensitivity of approximately 3.1 x 10(-11) cm(-1) Hz(-1/2). The instrument has been used for sensitive measurements of CO, CH4, C2H2 and NH3

引用

页码：261 / 265

页数：5

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