Ultra-sensitive cavity ring-down spectroscopy in the mid-infrared spectral region

被引：37
作者：
Long, D. A. [1 ]
Fleisher, A. J. [1 ]
Liu, Q. [1 ]
Hodges, J. T. [1 ]
机构：
[1] NIST, Mat Measurement Lab, Gaithersburg, MD 20899 USA
来源：
OPTICS LETTERS | 2016年 / 41卷 / 07期
关键词：
LASER; STABILIZATION; SPECTROMETER;
D O I：
10.1364/OL.41.001612
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We describe an ultra-sensitive cavity ring-down spectrometer which operates in the mid-infrared spectral region near 4.5 mu m. With this instrument a noise-equivalent absorption coefficient of 2.6 x 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.
引用
收藏
页码：1612 / 1615
页数：4
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