Pound-Drever-Hall稳频误差信号线性动态范围及灵敏度分析

Analysis of linear dynamic range and sensitivity of error signal in Pound-Drever-Hall method

在Pound-Drever-Hall激光稳频方法中,误差信号的线性动态范围和灵敏度是影响稳频效果的重要指标。为了对Pound-Drever-Hall激光稳频性能进行优化,本文理论分析了调制频率、FP腔镜反射率和腔长对动态范围及灵敏度的影响,并通过实验仿真进行定量讨论和优化。实验结果表明,调制频率、反射率和腔长都分别与线性动态范围的大小有着紧密的联系,通过对这些参数的正确选取,以及对精度和灵活性要求的综合考虑,可以提升稳频系统的效果;而且对调制深度的优化可以提高误差信号灵敏度。

In Pound-Drever-Hall laser frequency stabilization method,the linear dynamic range and sensitivity of error signal are important factors which affecting stabilization quality.To optimize the performance of Pound-Drever-Hall method,this paper analyzes the influence of modulation frequency,FP cavity mirrors′ reflection ratio and cavity length on dynamic range and sensitivity theoretically,and discuss in quantity by means of simulation.The results indicate that dynamic range and sensitivity have close relationship with modulation frequency,reflection ratio and cavity length;stabilization effect can be enhanced through proper selection of these parameters,as well as taking accuracy and flexibility requirements into account,and finally,optimizing modulation depth can improve sensitivity of error signal.