可调谐窄脉冲LD的工作温度稳定性对LD输出功率及波长稳定性的影响很大。为了实现LD驱动源的恒温控制, 采用半导体制冷器反馈式控制方法, 将热敏电阻与TEC相结合, 搭建由热沉、半导体制冷器及控制器和热敏电阻组成的恒温控制装置。通过对半导体制冷器工作原理的分析研究, 在TEC频率响应特性基础上, 选用MAX1978单片集成温度控制芯片控制热电致冷器的制冷热量, 加入PID温度补偿网络, 从而实现TEC的温度反馈式稳定控制。实验测试结果表明, 3 h连续工作下的温度能控制在±0.01 ℃, 1 A时的稳定度可达到1.487×10-4, 实现了对LD驱动源工作温度的精确控制, 从而保证LD波长的稳定输出。

Temperature stability of adjustable narrow pulse driver of LD is important to the output power and wavelength stability of LD. To realize thermostatic control of LD driver, TEC feedback control method was adopted. Thermostatically controlling equipment was set up, consisted of heat sink, TEC, controller and thermistor. By studying the operating principle of TEC, MAX1978 was selected as TEC temperature control chip. PID temperature compensation network was used to realize TEC feedback control. The experiment results show that temperature can be controlled in ±0.01 ℃ under 3 h continuous work, and the output current stability of A was up to 1.487×10-4, the precise control of LD driver working temperature and LD wavelength output are realized.