温度是影响半导体激光器 (LD) 寿命和输出特性的重要因素之一。为保证 LD 输出稳定的激光模式和功率, 采用以 ADC 和 DAC 集成的微处理器芯片 C8051F350 和具有双极性输出电流的 TEC 驱动芯片 MAX1968 为控制核心, 以积分分离和变速积分增量式相结合的数字 PID 算法为运算程序的自动温度控制系统 (ATC) 控制 TEC 驱动电流的 方向和大小,实现对 LD 的加热或制冷,使其工作在恒定温度。实验证明,应用该系统, LD 在0~40 ℃环境温 度范围内能很快稳定在设定温度,且其不确定度为±0.03 ℃。

The temperature is important for the properties of laser diode (LD). For increasing lifetime of LD and obtaining steady laser output, the automatic temperature control system to control the current of the thermo electric cooler (TEC) is applied. The temperature control system consists of C8051F350 which integrated with ADC and DAC and MAX1968 with two-way current output. It uses the enhanced digital PID algorithm combining integral separating and shift integration incremental algorithm to achieve the two-way control of the temperature of LD. The result shows that the temperature of laser can reach the value preset rapidly and stably with stability of ±0.03 ℃ while LD working in range from 00-40 ℃.