摘要
针对共振荧光测风雷达的探测需求,设计和研制了种子注入的Nd∶YAG电光调Q单频1116 nm脉冲激光器,采用带偏置电压反馈的扫描-触发谐振探测技术,建立了1116 nm单纵模振荡,并对中心频率稳定性进行分析。最终实现输出1116 nm激光单脉冲能量6.48 mJ,重复频率60 Hz,输出线宽为33.2 MHZ,脉冲宽度为75.7 ns。通过波长计测量输出光波长,波长稳定在1116.2979 nm附近。利用外差拍频,测定120 min中心频率稳定性(均方根)为818.3 kHz。该激光器输出光通过三倍频可变换至372 nm,作为铁共振荧光多普勒测风激光雷达的发射光源,频率抖动量对应的风速测量误差小于1 m/s。
Stable single-frequency all-solid state laser plays an important role in resonance fluorescence lidar.Owing to the advantages of compact and stable structure,all-solid single-frequency lasers have been developed rapidly in lidar vehicle-borne and airborne applications.Recently,a scheme for tripling 1116 nm laser to obtain the light source for iron resonance fluorescence lidar has been developed.There is a neodymium-doped yttrium aluminum(Nd∶YAG)garnet emission line lies at 1116 nm,which is within only a few gigahertz(GHz)of the tripled wavelength of the absorption line of iron at 372 nm.Therefore,the design of 1116 nm single-frequency laser and the measurement of frequency characteristics is essential for iron lidar.We demonstrated a stable single-frequency 1116 nm Nd∶YAG laser in this paper.An optimized ramp-fire scheme is applied to realize the seed injection and frequency jitter control.This singlefrequency laser has a compact all-solid structure and a good stability to be as fundamental frequency applied in iron lidar.The 1116 nm single-frequency laser system mainly includes three parts:a distributed feedback fiber laser as the 1116 nm seed,a side-pumped Nd∶YAG straight-cavity slave laser and a detection-control system module.The fiber laser provides a stable 1116 nm continuous laser with a spectral signal-to-noise ratio at 79 dB.A set of wave plates is placed between seed and slave cavity to adjust the polarization before entering slave cavity.The total cavity length is set to 54 cm with two piezoelectric transducers placed on two cavity mirrors.The detection-control system module detects the match degree between seed laser and slave cavity longitudinal mode while one piezoelectric transducer vibrating.When the interference between seed and the light reflected through the cavity reaches a maximum,detection-control system turns on the Q-switch and applies a direct current voltage to the other piezoelectric transducer to compensate for the nonlinear vibration.Then the 1116 nm single-frequency pulse is es
作者
董啸岳
刘爽
秘国江
王克强
毛小洁
DONG Xiaoyue;LIU Shuang;BI Guojiang;WANG Keqiang;MAO Xiaojie(The 11th Institute of China Electronics Technology Group Corporation,Beijing 100015,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2024年第1期13-22,共10页
Acta Photonica Sinica
基金
国防科技基础加强计划基金(No.E2020XXXXXX40)。
关键词
固体激光器
单频激光器
种子注入
频率稳定性
多普勒雷达
Solid state laser
Single-frequency laser
Seed injection
Frequency stability
Doppler radar
