基于模糊控制的自适应激光功率稳定系统研究  

Self-Adaptive Laser Power Stabilization System Based on Fuzzy Control

作　　者：欧阳鑫川 杨博文 万金银[1] 肖玲[1] 成华东[1,2] Ouyang Xinchuan;Yang Bowen;Wan Jinyin;Xiao Ling;Cheng Huadong(Key Laboratory of Quantum Optics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所量子光学重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2021年第1期43-49,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(61875215)。

摘　　要：研究了一种基于模糊控制的嵌入式激光功率稳定系统,用声光调制器作为功率稳定的外部环路反馈器件,采用模数转换器和数模转换器以及数字信号处理芯片组成数控功率稳定电路。用模糊控制方案解决了传统比例-积分-微分(PID)的超调问题,反馈环路的稳定时间为1.8 ms。有效抑制了激光功率在低频部分的相对强度噪声,在1 Hz处从-88 dBc/Hz改善至-110 dBc/Hz。激光功率的相对起伏由0.29%降低至0.035%。相比于传统PID,模糊PID可以根据系统所处状态实时调整参数,从而达到自适应的效果。Objective Laser are used in many research fields such as quantum communication,atom cooling,atom clock,and materials processing.The power stability of laser is very important,especially in the field of quantum precision measurements where it directly affects the experimental measurement accuracy.For the atom clock,the power stability of the laser affects its stability and accuracy.Therefore,it is necessary to make the active laser power stabilization system.As a general control method,the fuzzy proportional-integral-differential(PID)control has been widely used in the closed-loop control systems,such as temperature control,path planning,flight attitude adjustment,etc.A recent study investigates the laser power stabilization with the analog circuit PID,but in which the values of PID parameters need to be readjusted if it is used in different environments and the stabilized value of laser power cannot be changed during the experiments.In order to solve these problems,the fuzzy PID control scheme is proposed.We hope that our solution can reduce the stable time of the feedback loop,improve the relative intensity noise,and achieve long-term stabilization of laser power.Methods There are two types of feedback loop for the laser power stabilization,one is feedback to the laser current(internal loop),and the other is feedback to an acoustic optical modulator(AOM)(external loop).Generally,the external lock loop is used because the internal loop will disturb the laser current and thus the frequency.In this paper,an embedded system of laser power stabilization based on fuzzy control is investigated.The lock loop is realized by feedback to an AOM.After passing through AOM,the laser generates diffractive light.By adjusting the diaphragm only+1 order diffraction light is allowed to pass through.After passing through the beam splitter,it is divided into two beams.One beam is detected by the photodetector,the other beam is used for experiments.The digital control circuit consists of an analog-to-digital(AD)converter,a digital-to

关 键 词：激光器 功率稳定 模糊控制 自适应 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]