大功率半导体激光器高精度温控系统研究

为了减小温度对半导体激光器输出光波长和功率稳定性的影响,设计了由恒流模块驱动半导体制冷器,通过改变恒流模块的电流来控制半导体制冷器的制冷量,利用分段积分的比例-积分-微分控制算法,选择最优控制参量,实现大功率半导体激光器的精密温控系统。系统包括高精度测温电路、控制核心DSP F28335、半导体制冷器控制电路、人机交互及通信模块。在5℃~26℃环境下对系统进行测试,实现50W大功率半导体激光器的恒温控制,温控范围为15℃~45℃,温控精度达到0.02℃。结果表明,该系统温控范围广,控制精度高,满足大功率半导体激光器的温控要求。

Research of precise temperature control systems of high-power semiconductor lasers

In order to reduce the influence of temperature on output wavelength and power stability of semiconductor lasers, a constant current module was designed to drive thermoelectric cooler. The cooling capacity of the thermoelectric cooler was controlled by changing the current of the constant current module. The optimal control parameters of proportion-integration-differentiation algorithm were set to realize high precision temperature control. The system consists of high precision temperature measurement circuit, control core of DSP F28335, thermoelectric cooler control circuit, human-computer interaction and communication module. Constant temperature control was realized for a 50W high power laser diode at 5℃~26℃ ambient temperature, the temperature control accuracy reached 0.02℃ at 15℃~45℃. The results show that this system has a wide temperature control range and high control precision, which satisfies the requirement of temperature control of high power semiconductor lasers.