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针对法布里-珀罗(FP)腔对更高稳定性的需求,提出了利用Pound-Drever-Hall(PDH)技术稳定FP腔的方案。根据理论计算模型,详细分析了FP腔谐振光学系统的静态响应与动态响应特性。运用静态分析得到的误差信号可实现FP腔的锁定,动态响应分析得到的频率响应有助于设计控制环路将FP腔稳定在选择的工作点处。数值仿真结果表明,当光学增益为0.785 W/(°),且误差信号为毫瓦量级时,FP腔的长度稳定精度可达4 pm。通过对比FP腔锁定前后反射光的光斑尺寸与形状,验证了该方案的有效性和可行性。
Aiming at the demand of Fabry-Perot (FP) cavity for higher stability, a scheme of stabilizing FP cavity by Pound-Drever-Hall (PDH) technique is proposed. According to the theoretical calculation model, the static response and the dynamic response of the FP cavity resonant optical system are analyzed in detail. The error signal obtained by static analysis can be used to lock the FP cavity. The frequency response of the dynamic response analysis helps to design the control loop to stabilize the FP cavity at the selected operating point. The numerical simulation results show that the FP cavity length stability accuracy can reach 4 pm when the optical gain is 0.785 W / (°) and the error signal is on the order of milliwatt. By contrasting the spot size and shape of the reflected light before and after the locking of the FP cavity, the feasibility and feasibility of the scheme is verified.