Pound-Drever-Hall稳频方法的Multisim建模分析

Modeling and analysis of Pound-Drever-Hall method using Multisim

Pound-Drever-Hall(PDH)稳频方法涉及光学和电学2个部分,综合仿真较为困难。针对该问题,设计了PDH的电路部分。根据器件的工作原理,采用电路模型搭建光学元件。在此基础上进行了器件的单独仿真和开环PDH光、电综合仿真,仿真使用长度为15 cm,腔镜反射率为0.97的Fabry-Pérot腔(F-P腔),并采用20 MHz的调制频率。仿真结果表明:器件模型搭建合理;激光器在无频率漂移时,系统输出较小幅度的零漂移信号;在频率漂移为5 MHz,10 MHz,15 MHz时,系统输出较为理想的误差信号。最后对仿真结果进行了讨论,并提出了改进方案。

Pound-Drever-Hall（PDH） stabilization involves both optics and electrics parts,and it is difficult to simulate PDH method synthetically.This article is aimed at solving this problem.Firstly,the electrical part of PDH was designed.Then,the model of electric circuit was used to form the optical device after analyzing the operation principle.Based on these,independent tests of devices and a synthetic simulation were successfully carried out.The Fabry-Pérot cavity（F-P cavity） used in simulation has a length of 15 cm with a mirror reflectivity of 0.97.The simulation results prove that the model of the devices is reasonable.The system outputs a small zero-drift signal while the frequency shift is zero.At the frequency shift of 5 MHz,10 MHz and 15 MHz,the system has satisfactory outputs respectively.Some discussion on synthetic simulation result and proposals for improvement are given.