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基于声光频移器反馈控制的397.5 nm紫外激光功率稳定研究

397.5 nm Ultra-Violet Laser Power Stabilization Based on Feedback Control via Acousto-Optic Frequency Shifter

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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。

Abstract

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.

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中图分类号:O436

DOI:10.3788/cjl201845.1001008

所属栏目:激光器件与激光物理

基金项目: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

收稿日期:2018-03-28

修改稿日期:2018-05-14

网络出版日期:2018-06-04

作者单位    点击查看

白乐乐:山西大学量子光学与光量子器件国家重点实验室, 山西 太原 030006山西大学光电研究所, 山西 太原 030006
温馨:山西大学量子光学与光量子器件国家重点实验室, 山西 太原 030006山西大学光电研究所, 山西 太原 030006
杨煜林:山西大学量子光学与光量子器件国家重点实验室, 山西 太原 030006山西大学光电研究所, 山西 太原 030006
刘金玉:山西大学量子光学与光量子器件国家重点实验室, 山西 太原 030006山西大学光电研究所, 山西 太原 030006
何军:山西大学量子光学与光量子器件国家重点实验室, 山西 太原 030006山西大学光电研究所, 山西 太原 030006山西大学极端光学协同创新中心, 山西 太原 030006
王军民:山西大学量子光学与光量子器件国家重点实验室, 山西 太原 030006山西大学光电研究所, 山西 太原 030006山西大学极端光学协同创新中心, 山西 太原 030006

联系人作者:王军民(wwjjmm@sxu.edu.cn)

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引用该论文

Bai Lele,Wen Xin,Yang Yulin,Liu Jinyu,He Jun,Wang Junmin. 397.5 nm Ultra-Violet Laser Power Stabilization Based on Feedback Control via Acousto-Optic Frequency Shifter[J]. Chinese Journal of Lasers, 2018, 45(10): 1001008

白乐乐,温馨,杨煜林,刘金玉,何军,王军民. 基于声光频移器反馈控制的397.5 nm紫外激光功率稳定研究[J]. 中国激光, 2018, 45(10): 1001008

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