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

被引：24

作者：

Baer, DS ^{[1
]}

Paul, JB ^{[1
]}

Gupta, M ^{[1
]}

O'Keefe, A ^{[1
]}

机构：

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

来源：

DIODE LASERS AND APPLICATIONS IN ATMOSPHERIC SENSING | 2002年 / 4817卷

关键词：

absorption spectroscopy; diode laser; cavity enhanced spectroscopy;

D O I：

10.1117/12.451461

中图分类号：

TP7 [遥感技术];

学科分类号：

081102 ; 0816 ; 081602 ; 083002 ; 1404 ;

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-infrared 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 similar to1.4x10(-5) over an effective optical path of 4,200 meters was obtained in a 1.1-Hz detection bandwidth to yield a detection sensitivity of similar to3.1x10(-11) cm(-1) Hz-(1/2). The instrument has been applied for measurements of CO, CH4, C2H2, and NH3 in the 1530-1650 nm range, and stable isotopes Of CO2 ((CO2)-C-13, (CO2)-C-12, (COO)-C-12-O-16-O-18) near 2052 nm.

引用

页码：167 / 176

页数：10

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