Ultrasensitive near-infrared integrated cavity output spectroscopy technique for detection of CO at 1.57 μm:: new sensitivity limits for absorption measurements in passive optical cavities

被引：76

作者：

Engel, Gregory S. ^{[1
]}

Drisdell, Walter S. ^{[1
]}

Keutsch, Frank N. ^{[1
]}

Moyer, Elisabeth J. ^{[1
]}

Anderson, James G. ^{[1
]}

机构：

[1] Harvard Univ, Dept Chem, Cambridge, MA 02138 USA

来源：

APPLIED OPTICS | 2006年 / 45卷 / 36期

关键词：

D O I：

10.1364/AO.45.009221

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A robust absorption spectrometer using the off-axis integrated cavity output spectroscopy (ICOS) technique in a passive cavity is presented. The observed sensitivity, conceptually the detection threshold for the absorption cross section (cm) multiplied by the concentration (cm(-3)) and normalized by the averaging time, is measured to be 1.9 x 10(-12) (1/cm root Hz). This high sensitivity arises from using the optical cavity to amplify the observed path length in the spectrometer while avoiding cavity resonances by careful design of the spot pattern within the cavity. The instrument is ideally suited for routine monitoring of trace gases in the near-infrared region. A spectrum showing ambient carbon monoxide at 1.57 mu m is presented.

引用

页码：9221 / 9229

页数：9

共 22 条

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