为了解决大功率半导体激光器的输出波长和功率的稳定性问题, 设计了一套大功率激光器恒流驱动电源及温控系统。利用深度负反馈电路实现对激光器驱动电流的恒流控制, 采用硬件比例-积分(Proportional-Integral, PI)温控电路结合恒流驱动, 控制半导体制冷器(Thermoelectric Cooler, TEC)的工作电流, 实现激光器工作温度的精确控制。所设计的驱动电源可实现输出电流0~12.5 A连续可调, 同时具有电流检测、过流保护、晶体管-晶体管逻辑(Transistor-Transistor Logic, TTL)信号调制等功能。所设计的温控系统的控制精度可达到±0.05 ℃, 同时设定温度连续可调, 温度可实时监测。实验结果表明该设计能够保证稳定的电流输出和温度控制, 满足大功率激光器的使用要求。

In order to solve the output wavelength and power stability of high power semiconductor laser, high power semiconductor laser constant current driver and temperature control system were designed. Deep negative feedback circuit was used to control the laser drive current, the analog Proportional-Integral(PI) circuit and constant current driver were adopted to control the working current of Thermoelectric Cooler(TEC), the laser working temperature can be kept accurately. The design can realize the linear adjustment of output current from 0-12.5 A, and has the function of current detection, over-current protection and Transistor-Transistor Logic(TTL) modulation. The control precision of the temperature control system can achieve ±0.05 ℃. Temperature can be adjusted continuously and can be monitored in real time. Experiment results show that the design can guarantee the output current and temperature control stably, which satisfies the requirement of high power semiconductor laser.