Sensitivity of coherent dual-comb spectroscopy
Sensitivity of coherent dual-comb spectroscopy
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DOI：
10.1364/oe.18.007929
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发表时间：
2010-04-12
期刊：
影响因子：
3.8
通讯作者：
Swann, William
中科院分区：
文献类型：
--
作者：
Newbury, Nathan R.;Coddington, Ian;Swann, William
相干双梳光谱可以提供样品响应幅度和相位的高分辨率、高精度测量。我们讨论了由于加性白噪声和乘性噪声而可实现的信噪比 (SNR)，以及痕量气体检测的相应灵敏度限制。我们表明，在某些情况下，通过可调谐滤波器顺序采集整个光谱，或通过探测器阵列并行采集整个光谱，可以显着提高信噪比。我们将一个有用的品质因数确定为品质因数，等于 SNR 的乘积（通过采集时间的平方根归一化）与解析的频率元素的数量。对于单个探测器和基于光纤激光器的系统，该品质因数为 10(6) - 10(7) Hz(1/2)。美国政府的作品，不受版权保护。
Coherent dual comb spectroscopy can provide high-resolution, high-accuracy measurements of a sample response in both magnitude and phase. We discuss the achievable signal-to-noise ratio (SNR) due to both additive white noise and multiplicative noise, and the corresponding sensitivity limit for trace gas detection. We show that sequential acquisition of the overall spectrum through a tunable filter, or parallel acquisition of the overall spectrum through a detector array, can significantly improve the SNR under some circumstances. We identify a useful figure of merit as the quality factor, equal to the product of the SNR, normalized by the square root of the acquisition time, and the number of resolved frequency elements. For a single detector and fiber-laser based system, this quality factor is 10(6) - 10(7) Hz(1/2). Work of the U. S. government, not subject to copyright.