激光衰荡测量中腔内能量动态过程分析研究  

Analysis of intracavity energy dynamic processes in laser cavity ring-down measurement

作　　者：朱媛 余锦 貊泽强[2,3] 唐吉龙 魏志鹏[1] ZHU Yuan;YU Jin;MO Ze-qiang;TANG Ji-long;WEI Zhi-peng(State Key Laboratory of High Power Semiconductor Laser of Changchun University of Science and Technology,Changchun 130022,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;Key Laboratory of Computational Optical Imaging Technology,Chinese Academy of Sciences,Beijing 100094,China;University of Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]长春理工大学高功率半导体激光国家重点实验室,吉林长春130022 [2]中国科学院空天信息创新研究院,北京100094 [3]中国科学院计算光学成像技术重点实验室,北京100094 [4]中国科学院大学,北京100094

出　　处：《激光与红外》2022年第10期1543-1550,共8页Laser & Infrared

基　　金：国家自然科学基金项目(No.12074045);吉林省创新创业人才项目(No.2020016)资助。

摘　　要：从激光衰荡中衰荡腔内能量的动态变化出发,考察了电流调制腔衰荡的频率匹配过程,分析了激光波长扫描速率对光强注入变化的影响,进而解释了光关断后衰荡曲线出现过充畸变的原因,研究了不同充光时间下检测精度的变化规律。实验考察了不同触发阈值和延迟时间等参数设置下激光衰荡过程,发现随着触发阈值的增加,测量精度和灵敏度提升,但衰荡检测频率明显下降,因此触发阈值的设置应同时兼顾测量精度和测量频率要求。此外,延迟时间的增加会影响测量幅值的稳定,但可获得较高的测量精度和衰荡时间。实验中当延迟时间为400 ns时,测量幅值与测量精度达到平衡,此时衰荡时间为39.1403μs,测量精度为0.0162。In this paper,based on the dynamic change of energy in the ring-down cavity in the laser ring-down,the frequency matching process of the current-modulated cavity ring-down is investigated,and the influence of the laser wavelength scanning rate on the change of light intensity injection is analyzed,then the reason for the overcharge distortion of the decay curve after the light is turned off is explained,and the change law of detection accuracy under different light charging times is studied.The laser ring-down process under different trigger threshold and delay time parameter is investigated experimentally.It is found that as the trigger threshold increases,the measurement accuracy and sensitivity increase,but the ring-down detection frequency is significantly reduced,so the trigger threshold setting should take into account both the measurement accuracy and measurement frequency requirements.In addition,the increase of the delay time affects the stability of the measurement amplitude,but higher measurement accuracy and ring-down time can be obtained.In the experiment,when the delay time is 400 ns,the measurement amplitude and measurement accuracy reach a balance,at which time,the ring-down time is 39.1403μs,and the measurement accuracy is 0.0162.

关 键 词：腔衰荡光谱 电流调制 频率匹配 阈值调节 关断延迟 

分 类 号：O433.5[机械工程—光学工程]