Ultra-sensitive cavity ring-down spectroscopy in the mid-infrared spectral region.
Ultra-sensitive cavity ring-down spectroscopy in the mid-infrared spectral region.
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DOI：
10.1364/ol.41.001612
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发表时间：
2016-04-01
期刊：
影响因子：
3.6
通讯作者：
Hodges JT
中科院分区：
文献类型：
--
作者：
Long DA;Fleisher AJ;Liu Q;Hodges JT
我们描述了一个超灵敏的腔衰荡光谱仪，它工作在4.5 μ m附近的中红外光谱区。使用该仪器，当入射到光电探测器上的光功率小于150 nW时，噪声等效吸收系数为2.6 × 10 − 11 cm − 1 Hz − 1/2。在单个衰荡衰减事件中观察到量子噪声，导致量子噪声限制的短时性能。我们相信，这种光谱仪的高灵敏度和鲁棒性相结合，使其非常适合于测量超痕量气体物种以及在光学和基础物理的应用。
We describe an ultra-sensitive cavity ring-down spectrometer which operates in the mid-infrared spectral region near 4.5 µm. With this instrument a noise-equivalent absorption coefficient of 2.6×10−11 cm−1 Hz−1/2 was demonstrated with less than 150 nW of optical power incident on the photodetector. Quantum noise was observed in the individual ring-down decay events, leading to quantum-noise-limited short-time performance. We believe that this spectrometer’s combination of high sensitivity and robustness make it well suited for measurements of ultra-trace gas species as well as applications in optics and fundamental physics.