摘要
基于声光频移器设计的反馈环路,对397.5 nm紫外激光功率起伏进行反馈抑制。整套系统通过比例积分电路得到的误差信号来改变声光频移器的射频功率,利用声光频移器的布拉格衍射方式对激光功率进行控制,从而实现激光功率的长时间稳定。另外还对通过倍频产生的紫外激光特性进行了分析。最后,通过反馈系统在时域上实现了紫外激光功率的相对起伏,由±11.739%降至±0.053%,稳定度改善约220倍;在频域1～8000 Hz范围内,其功率谱密度得到明显的降低;在5 kHz频率处,功率谱密度由9.6×10^(-5) dBV·Hz^(-1/2)改善为1.9×10^(-6) dBV·Hz^(-1/2)。
Optical power of a 397.5 nm ultra-violet laser can be inhabited by the feedback loop based on acousto-optic frequency shifter. The laser power is stabilized through changing the radio frequency power of the frequency shifter by error signal obtained by feedback, and controlling the laser power by the Bragg diffraction of the frequency shifter. The characteristics of the ultraviolet laser generated through frequency doubling is analyzed. Finally, in the time domain, the fluctuation of ultra-violet laser is remarkably decreased from ±11.739% to ±0.053% by the feedback （220 times improvement）. In the frequency domain of 1 Hz to 8000 Hz, the power spectra density of laser is dramatically reduced. Typically at 5 kHz, the power spectra density is improved from 9.6×10^-5 dBV·Hz^-1/2 to 1.9×10^-6 dBV·Hz^-1/2.
作者
白乐乐
温馨
杨煜林
刘金玉
何军
王军民
Bai Lele; Wen Xin; Yang Yulin; Liu Jinyu; He Jun; Wang Junmin(State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan, Shanxi 030006, China; Institute of Opto-Electronics, Shanxi University, Taiyuan, Shanxi 030006, China ; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2018年第10期46-52,共7页
Chinese Journal of Lasers
基金
国家重点研发计划(2017YFA0304502)
国家自然科学基金(61227902
61475091
11774210)
山西省1331重点学科建设工程项目
关键词
激光器
声光频移器
激光功率
倍频
反馈控制
相对起伏
功率谱密度
lasers
acousto-optic frequency shifter
laser power
frequency doubling
feedback control
relative fluctuation
power spectra density
