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

机译:室温中红外激光传感器,用于痕量气体检测

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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.
机译:报告了紧凑,便携式,室温中红外气体传感器的设计和操作。该传感器基于4.6微米的周期性周期性极化铌酸锂的连续波差频生成(DFG),由一个865 nm的单独GaAlAs二极管激光器和一个1064.5 nm的二极管泵浦单片环形Nd:YAG激光器泵浦。该仪器用于在大气压力下以1 ppb的精度(摩尔比为10(9)的分数)和0.6%的精度检测空气中的CO,信号平均时间为10 s。它采用了一个紧凑的多通道吸收池,其光程为18 m,并装有热电冷却的HgCdTe检测器。精度受到多通孔中散射产生的残余干涉条纹的限制。这是在室温下基于二极管泵浦DFG的便携式高精度气体传感器的第一个演示。使用外腔二极管激光器可以提供700 cm(-1)的调谐范围,并允许检测多种痕量气体,包括N2O,CO2,SO2,H2CO和CH4。 (C)1997年美国眼镜学会。

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