通过系统地分析影响LD稳定性的主要因素,设计出了计算机实时检测反馈、闭环控制、脉冲稳流的高频LD驱动电源。采用抑制浪涌,减小纹波以及加入延时和软启动电路等多项安全设计及措施确保LD工作的安全性。并且采用半导体制冷片,结合计算机实时检测电路对LD工作温度进行精确控制。初步测量得到LD激光稳定输出功率150 W,温度稳定电路的控温精度达到0.2℃,激光频宽为6 GHz的实验结果。

On the basis of analyzing the main factors effecting on the LD stability,a 1 kHz repeating frequency LD driving power supply with real-time feedback,closed-loop control and pulse current stabilization was designed.By restraining the surge and the ripple,adopting the delay-time and soft-startup circuit,this system improves the security of both the LD component and power supply.With the thermo-electronic cooler and PC that can detect the circuit real-time,the temperature of the LD can be kept accurately.Primarily,the LD laser output power is 150 W,the stability of the constant temperature power is 0.2 ℃,and the laser line width is about 6 GHz in the experiment.