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Characterization of a near-room-temperature, continuous-wave quantum cascade laser for long-term, unattended monitoring of nitric oxide in the atmosphere

机译:近室温连续波量子级联激光器的特性,可长期,无人值守监测大气中的一氧化氮

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We report on power, spectral linewidth, and mode purity for a cw 5.3 mu m quantum cascade laser operated on a thermo-electric cooler. A totally noncryogenic nitric oxide monitor was constructed by integrating this laser with an astigmatic multipass cell and a thermo-electrically cooled infrared detector. The resulting instrument is capable of continuous unattended monitoring of ambient, atmospheric nitric oxide for several weeks with no operator intervention. The detection method was rapid sweep, direct absorption spectroscopy. A detection sensitivity of 0.03 parts in 10(9) is achieved with 30 s averaging time with a path length of 210 m, corresponding to an absorbance path length product of 1.5 X 10-(10) cm(-1). (c) 2006 Optical Society of America.
机译:我们报告了在热电冷却器上运行的5.3微米连续式量子级联激光器的功率,光谱线宽和模式纯度。通过将这种激光器与像散多通道电池和热电冷却红外探测器集成在一起,可以构造出一种完全非低温的一氧化氮监测仪。最终的仪器能够连续数周无人值守地监视周围的大气一氧化氮,而无需操作员干预。检测方法为快速扫描,直接吸收光谱法。平均时间为30 s,光程长度为210 m,对应于1.5 X 10-(10)cm(-1)的吸收光程长度积,检测灵敏度为10(9)0.03份。 (c)2006年美国眼镜学会。

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