Room-temperature mid-infrared laser sensor for trace gas detection

被引：98

作者：

Topfer, T ^{[1
]}

Petrov, KP ^{[1
]}

Mine, Y ^{[1
]}

Jundt, D ^{[1
]}

Curl, RF ^{[1
]}

Tittel, FK ^{[1
]}

机构：

[1] CRYSTAL TECHNOL INC,PALO ALTO,CA 94303

来源：

APPLIED OPTICS | 1997年 / 36卷 / 30期

关键词：

trace gas detection; mid-infrared spectroscopy; difference-frequency generation; diode-pumped difference-frequency generation; quasi-phase-matching; periodically poled lithium niobate; gas sensors;

D O I：

10.1364/AO.36.008042

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Design and operation of a compact, portable, room-temperature mid-infrared gas sensor is reported. The sensor is based on continuous-wave difference-frequency generation (DFG) in bulk periodically poled lithium niobate at 4.6 mu m, pumped by a solitary GaAlAs diode laser at 865 nm and a diode-pumped monolithic ring Nd:YAG laser at 1064.5 nm. The instrument was used for detection of CO in air at atmospheric pressure with 1 ppb precision (parts in 10(9), by mole fraction) and 0.6% accuracy for a signal averaging time of 10 s. It employed a compact multipass absorption cell with a 18-m path length and a thermoelectrically cooled HgCdTe detector. Precision was limited by residual interference fringes arising from scattering in the multipass cell. This is the fist demonstration of a portable high-precision gas sensor based on diode-pumped DFG at room temperature. The use of an external-cavity diode laser can provide a tuning range of 700 cm(-1) and allow the detection of several trace gases, including N2O, CO2, SO2, H2CO, and CH4. (C) 1997 Optical Society of America.

引用

页码：8042 / 8049

页数：8

共 28 条

[1]

ARBORE MA, 1996, OSA, V10, P42

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