量子电子学报2025，Vol.42Issue(3)：405-413,9.DOI:10.3969/j.issn.1007-5461.2025.03.012
抑制激光干涉条纹增强激光波长调制信噪比的方法研究
A method of suppressing laser interference fringes to enhance signal-to-noise ratio of laser wavelength modulation
摘要
Abstract
To suppress the optical interference fringes generated by dense-pattern optical multipass cells and enhance the detection accuracy and sensitivity of gas sensors,this work proposes a data averaging method within integer multiples(100)of the free spectral range to suppress laser optical interference fringes,in which the detection accuracy,sensitivity,and signal-to-noise ratio(SNR)for trace gas can be improved by investigating optimal average number of data points.Experimental results demonstrate that compared with the baseline standard deviations of 0.019 arb.units and 0.063 arb.units of the second harmonic signal obtained by the conventional interference fringe suppression method,those obtained by the porposed novel interference fringe suppression method 0.003 arb.units and 0.0066 arb.units respectively,increasing 6.33 times and 9.55 times correspondingly.The SNR of the novel method is increased by factors of 4.24 and 6.48 respectively.The detection sensitivity is 0.0008 ug/m-3,increased by a factor of approximately 3.75.The detection accuracy is 0.49 ug/m-3,increased by about 1.5 times.It is indicated that this proposed mthod can effectively mitigate the influence of optical interference fringes on measurement outcomes.关键词
波动光学/光学干涉条纹抑制/特定光谱范围信号处理法/信噪比Key words
wave optics/suppression of optical interference fringes/signal processing in specific spectral range/signal-to-noise ratio分类
物理学引用本文复制引用
程鑫,曹亚南,马燕莺,李燕,程刚,田兴..抑制激光干涉条纹增强激光波长调制信噪比的方法研究[J].量子电子学报,2025,42(3):405-413,9.基金项目
机械工业矿山采选装备智能化重点实验室开放基金(2022KLMI06),安徽省高等学校科学研究项目(2023AH051194),国家自然科学基金项目(62105005),安徽省高校优秀青年人才支持计划项目(gxyq2021179),煤炭安全精准开采国家地方联合工程研究中心开放基金(EC2021010) （2022KLMI06）
