设计了一种基于频率补偿技术的高精度、高稳定度抽运激光器驱动电路,该驱动电路以深度负反馈系统的电流调节为内环,光功率反馈调节为外环,同时采用一阶人工分析与Tina SPICE仿真相结合的方法,对环路进行频率补偿,实现了抽运激光器的高稳定性控制。通过模拟比例积分微分技术控制驱动芯片,实现半导体制冷器的电流调节。所设计的驱动电路在自动电流控制模式下输出连续可调的电流,同时具有慢启动、防反向电流和过流保护等功能,输出电流长期稳定度可达0.04%。在自动功率控制模式下,激光器输出功率长期稳定度优于0.3%,控制线性度达0.9999,温控的长期稳定性优于0.0928%。实验结果表明,该驱动系统具有安全性高、稳定性好、使用方便等优点。

A pump laser drive circuit with high precision and high stability is designed based on frequency compensation technique. The laser can be operated in two modes: automatic current control (ACC) and automatic power control (APC). The drive circuit considers the current adjustment of the deep negative feedback system as the inner loop and the optical power feedback adjustment as the outer loop. Simultaneously, by combining first-order artificial analysis and Tina SPICE simulation, the frequency compensation of the loop is performed to realize high stability control of the pump laser. The drive chip is controlled via analog proportion-integration-differentiation technology to regulate the current of a thermoelectric cooler. The designed drive circuit supplies continuously adjusted output current in ACC mode; it has the following functions: slow start, reverse current prevention, and over-current protection. In ACC mode, the long-term stability of the output current reaches 0.04%. In APC mode, the long-term stability of the laser output power is better than 0.3%, the control linearity reaches 0.9999,and the long-term stability of the temperature control is better than 0.0928%. The experimental results demonstrate that this driving system has high security, high stability, and is easy to use.