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Abstract

Off-axis integrated cavity output spectroscopy (OA-ICOS) is a highly sensitive laser spectroscopy technique. However, due to the use of dense high-order modes for detection, OA-ICOS signal power is low, thus making the detection sensitivity highly dependent on the laser power. To this problem, we introduce an optical re-injection method to re-inject the laser back into the optical cavity again, improving the utilization of laser energy and the power of signal. In this paper, we use optical tracking software to design a re-injection structure, and study several factors affecting the signal gain. Then, we build a re-injection OA-ICOS device in the 2 μm band and also conduct a series of experimental researches. Our results show that the re-injection method enhances the OA-ICOS signal power 8 times and signal-to-noise ratio 4.6 times, which effectively improves the detection sensitivity and the absorption depth of the spectral signal, and alleviates the problem of low signal power in OA-ICOS detection.

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Authors and contacts

Corresponding author:Cao Zhen-Song,zscao@aiofm.ac.cn

Funds:Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA17010104) and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2015264).

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影响参数	光斑分布
影响参数	M_re光斑数量上限	M_re光斑总数	M_re光斑密度	M_re光斑分布形状	M_out能量分布密度	约束入射角度
M_re曲率半径R		√	√		√
M_re与M_in间距L(再入射位置)		√	√			√
XY方向入射光角度			√	√	√
再入射孔离轴距离	√

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Vol. 68, Issue 12 - 2019-06-20

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