光学精密工程2026，Vol.34Issue(15)：2280-2288,9.DOI:10.37188/OPE.20263415.2280
基于频率调制相位优化的激光稳频及其腔衰荡光谱应用
Laser frequency stabilization based on phase optimization of frequency modulation and its application in cavity ring-down spectroscopy
摘要
Abstract
Laser-frequency drift and excessive linewidth limit rapid,cost-effective single-point measure-ments in cavity ring-down spectroscopy(CRDS).This work investigates the relationship between modu-lation frequency and demodulation-phase selection in frequency-modulation spectroscopy(FMS)and ap-plies it to laser-frequency stabilization for acetylene CRDS.The modulation-frequency dependence of ab-sorption-and dispersion-phase error signals was analyzed theoretically.The analysis identified an approxi-mately 300 MHz crossover:the absorption phase dominated below 300 MHz,whereas the dispersion phase provided a larger error signal at higher modulation frequencies.An FPGA-based frequency-stabiliza-tion system was developed,and the measured peak-to-peak error-signal variation agreed closely with the theoretical prediction.After optimizing gas pressure and concentration,a proportional-integral-derivative controller locked the laser to the center of the acetylene absorption line,thereby improving frequency sta-bility and reducing the effective linewidth.The stabilized laser was then evaluated in CRDS measure-ments.Allan-variance analysis yielded detection limits of 6.23×10-10 cm-1 at 9 MHz in the absorption phase and 2.51×10-10 cm-1 at 350 MHz in the dispersion phase,compared with 1.55×10-9 cm-1 without stabilization.These values correspond to improvements by factors of 2.49 and 6.18,respectively.Al-though high-frequency dispersion-phase detection achieved the lower detection limit,its advantage should be balanced against increased hardware requirements.The approach supports high-precision,low-cost gas monitoring in environmental and industrial sensing applications.关键词
激光光谱/腔衰荡光谱/频率调制光谱/激光稳频/痕量气体检测Key words
Laser spectroscopy/cavity ring-down spectroscopy/frequency modulation spectroscopic/la-ser frequency stabilization/trace gas detection分类
数理科学引用本文复制引用
周月婷,王孟圆,翟保杰,邱选兵,李传亮..基于频率调制相位优化的激光稳频及其腔衰荡光谱应用[J].光学精密工程,2026,34(15):2280-2288,9.基金项目
国家自然科学基金资助项目(No.62475182,No.62505213,No.52506204,No.12304403) （No.62475182,No.62505213,No.52506204,No.12304403）
山西省重点研发计划资助项目(No.202402150301012,No.202402130501005,No.202302150101006) （No.202402150301012,No.202402130501005,No.202302150101006）
中央引导地方科技发展资金项目(No.YDZJSX2025C026) （No.YDZJSX2025C026）
山西省科技合作交流专项资助项目(No.202304041101022) （No.202304041101022）
