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提出了一种新的基于预热温度轨迹规划和轨迹跟踪的塞曼稳频激光器预热控制方法。根据纵向塞曼激光器稳频控制过程的特点,规划了预热过程中谐振腔的一阶指数温度轨迹,以在不同温度环境下兼顾预热效率和稳频效果。采用预测函数控制(PFC)算法,通过预测输出的滚动优化和反馈校正,使激光器谐振腔温度精确跟踪规划轨迹上升直至逼近预设温度阈值sθet。最后,建立纵向塞曼激光器预热及稳频控制系统,在不同环境温度下对本文预热方法进行实验验证。实验结果表明,在15~25℃内,基于本文控制方法的稳频系统可在16 min内完成预热和激光频率锁定,且不同环境温度下的锁定温度变化范围<0.4℃,相应的中心频率环境温度漂移<0.25 MHz(相对漂移0.5×10-9)。该方法为提高稳频系统的预热效率和稳频效果提供了一种新的技术途径。
A new preheating control method of Zeeman frequency stabilization laser based on preheat temperature trajectory planning and trajectory tracking is proposed. According to the characteristics of vertical Zeeman laser frequency stabilization control process, the first-order exponential temperature trajectory of the resonator in the preheating process is planned to balance the preheating efficiency and the frequency stabilization effect under different temperature conditions. Predictive function control (PFC) algorithm is adopted to predict the output of the rolling optimization and feedback correction, so that the laser cavity temperature tracking trajectory accurately track up until the preset temperature threshold sθet. Finally, a longitudinal Zeeman laser preheating and frequency stabilization control system is established, and the experiment of the preheating method in this paper is validated under different ambient temperatures. The experimental results show that the frequency stabilization system based on the control method in this paper can complete the preheating and laser frequency locking within 16 min at 15 ~ 25 ℃, and the temperature range of locking under different ambient temperature <0.4 ℃, the corresponding center frequency Ambient temperature drift <0.25 MHz (relative drift 0.5 × 10-9). The method provides a new technical approach to improve the preheating efficiency and frequency stabilization effect of the frequency stabilization system.