一种拓宽PDH稳频系统动态范围的新方法研究

鉴于传统Pound-Drever-Hall（PDH）锁相稳频技术在稳定光腔时存在锁定的动态范围很窄且抗干扰能力差等问题，建立一种可拓宽PDH系统动态范围的稳频锁腔方法。采用传统的PDH误差信号除以透射功率来新定义一个PDH误差信号，拓宽了传统的PDH稳频锁腔的线性区域。此外，采用了卡尔曼滤波器，当存在噪声时，也能估计反射镜的状态，并设计了反馈控制系统，使得PDH稳频系统可在更宽的动态范围内快速锁定。仿真结果表明，在存在扰动和噪声情况下，该方法也可以使PDH稳频系统的动态范围增加50倍。

A method to broaden the dynamic range of PDH frequency stabilization system

In view of the problems of the traditional Pound-Drever-Hall(PDH) phase-locked frequency stabilization technique in stabilizing optical resonators, such as the dynamic range of this method is usually very narrow and the anti-jamming ability is poor. This paper establishes a scheme of frequency stabilization and cavity locking which can broaden the dynamic range of PDH system. The traditional error signal divided by the transmission power serves as the new error signal, which increases the dynamic range in the linear regime. In addition, the Kalman filter algorithm is used to estimate the state of the mirror in the presence of noise, and a feedback control system is designed, so that the system can be locked quickly in a wider dynamic range. The simulation results show that the dynamic range of PDH frequency stabilization system can be increased by 50 times in the presence of disturbance and noise.