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首页> 外文期刊>Applied optics >Ultrasensitive near-infrared integrated cavity output spectroscopy technique for detection of CO at 1.57 (mu)m: new sensitivity limits for absorption measurements in passive optical cavities
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Ultrasensitive near-infrared integrated cavity output spectroscopy technique for detection of CO at 1.57 (mu)m: new sensitivity limits for absorption measurements in passive optical cavities

机译：用于检测1.57μm处的CO的超灵敏近红外集成腔输出光谱技术：无源光学腔中吸收测量的新灵敏度极限

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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~(2)) multiplied by the concentration (cm~(-3)) and normalized by the averaging time, is measured to be 1.9 X 10~(-12) (1/cm(Hz)~(1/2)). 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.
机译：提出了一种在无源腔中使用离轴集成腔输出光谱（ICOS）技术的鲁棒吸收光谱仪。观测到的灵敏度，从概念上讲是吸收截面（cm〜（2））的检测阈值乘以浓度（cm〜（-3））并通过平均时间归一化后测得的灵敏度，为1.9 X 10〜（-12 ）（1 / cm（Hz）〜（1/2））。这种高灵敏度来自于使用光学腔来放大光谱仪中观察到的路径长度，同时通过仔细设计腔内的光斑图案来避免腔共振。该仪器非常适合常规监视近红外区域中的痕量气体。给出了显示环境一氧化碳为1.57μm的光谱。

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