光学精密工程2025，Vol.33Issue(5)：665-676,12.DOI:10.37188/OPE.20253305.0665
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
摘要
Abstract
To mitigate the impact of overlapping spectra on the accuracy of spectral information extrac-tion,a multi-gas spectral detection method is proposed in this study,based on Sub-Doppler Noise-Im-mune 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,re-sulting 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 elimi-nates 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 C2H2 and NH3 at 1 531 nm.The results demonstrate that,under conditions of a mod-ulation frequency of 150 Hz and a modulation amplitude of 2.68 MHz,a sub-Doppler absorption signal of C2H2 exhibiting a saturation degree of 12.10 can be successfully excited within the optical cavity.Addition-ally,the sub-Doppler absorption of C2H2 is unaffected by the adjacent NH3 spectra and the Doppler back-ground.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 impuri-ty 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Key words
laser absorption spectroscopy/Noise-Immune Cavity-Enhanced Optical Heterodyne Molecu-lar Spectroscopy(NICE-OHMS)/sub-Doppler/overlapping spectral分类
物理学引用本文复制引用
李岩柯,章博,赵刚,周晓彬,杨家琪,闫晓娟,马维光..亚多普勒波长调制NICE-OHMS叠加光谱干扰抑制[J].光学精密工程,2025,33(5):665-676,12.基金项目
江淮前沿技术协同创新中心追梦基金资助项目(No.2023-ZM01C007) （No.2023-ZM01C007）
国家重点研发计划资助项目(No.2023YFF0614000,No.2022YFC3703900) （No.2023YFF0614000,No.2022YFC3703900）
国家自然科学基金资助项目(No.62327813,No.62175139,No.62375161,No.61975103) （No.62327813,No.62175139,No.62375161,No.61975103）
