亚多普勒波长调制NICE-OHMS叠加光谱干扰抑制  

Suppression of overlapping spectral interference based on sub-Doppler wavelength modulation NICE-OHMS

作　　者：李岩柯 章博 赵刚[1,2] 周晓彬 杨家琪 闫晓娟 马维光[1,2] LI Yanke;ZHANG Bo;ZHAO Gang;ZHOU Xiaobin;YANG Jiaqi;YAN Xiaojuan;MA Weiguang(State Key Laboratory of Quantum Optics Technologies and Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;Collegel of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学激光光谱研究所光量子技术与器件全国重点实验室,山西太原030006 [2]山西大学极端光学协同创新中心,山西太原030006 [3]山西大学物理电子工程学院,山西太原030006

出　　处：《光学精密工程》2025年第5期665-676,共12页Optics and Precision Engineering

基　　金：江淮前沿技术协同创新中心追梦基金资助项目(No.2023-ZM01C007);国家重点研发计划资助项目(No.2023YFF0614000,No.2022YFC3703900);国家自然科学基金资助项目(No.62327813,No.62175139,No.62375161,No.61975103)。

摘　　要：为了抑制叠加光谱对光谱信息提取准确性的影响,提出一种基于亚多普勒噪声免疫腔增强光外差分子光谱技术(NICE-OHMS)的多气体光谱检测方法,利用高精细度光学腔内建立起的高激光功率激发饱和吸收,显著提升光谱分辨率,抑制杂质气体的光谱干扰,并结合波长调制技术,消除亚多普勒上残余多普勒背景的影响。建立了波长调制亚多普勒NICE-OHMS模型,以1531 nm处C_(2)H_(2)和NH3跃迁线为例进行实验。实验结果表明:在波长调制频率为150 Hz,调制幅度为2.68 MHz的条件下,光学腔内可以激发饱和度为12.10的C_(2)H_(2)亚多普勒吸收信号,并且C_(2)H_(2)的亚多普勒不会受到相邻NH3光谱以及多普勒背景的干扰,通过阿伦方差分析系统探测灵敏度达到1.163×10^(-12)cm^(-1)。上述分析表明,利用该技术可以有效消除杂质气体的光谱干扰,同时保证光谱系统的高灵敏度和高选择性。To mitigate the impact of overlapping spectra on the accuracy of spectral information extraction,a multi-gas spectral detection method is proposed in this study,based on Sub-Doppler Noise-Immune Cavity-Enhanced Optical Heterodyne Molecular Spectroscopy(NICE-OHMS).This method lever⁃ages high laser power excitation saturation absorption established within a high-finesse optical cavity,resulting in a significant enhancement in spectral resolution and a reduction in spectral interference caused by impurity gases.Furthermore,the incorporation of wavelength modulation techniques effectively eliminates the influence of residual Doppler background on the sub-Doppler signal.A wavelength-modulated sub-Doppler NICE-OHMS model has been developed,with experimental investigations conducted using the transition lines of C_(2)H_(2)and NH3 at 1531 nm.The results demonstrate that,under conditions of a modulation frequency of 150 Hz and a modulation amplitude of 2.68 MHz,a sub-Doppler absorption signal of C_(2)H_(2)exhibiting a saturation degree of 12.10 can be successfully excited within the optical cavity.Additionally,the sub-Doppler absorption of C_(2)H_(2)is unaffected by the adjacent NH3 spectra and the Doppler background.The sensitivity of the detection system is determined to be 1.163×10^(-12) cm^(-1) via Allan variance analysis.These findings confirm that this technique effectively eliminates spectral interference from impurity gases while maintaining high sensitivity and selectivity within the spectral system.

关 键 词：激光吸收光谱 噪声免疫腔增强光外差分子光谱技术 亚多普勒 叠加光谱 

分 类 号：O433.1[机械工程—光学工程] TH741[理学—光学]