二极管泵浦1064nm单频Nd:YAG激光器输出功率稳定控制系统设计

摘要

介绍了激光二极管(LD)端面泵浦1064 nm单频Nd:YAG激光器的工作原理和结构特点,分析了影响这种固体激光器输出功率稳定性的主要因素,设计并实验研究了一种用于稳定该激光器输出功率的控制方案.该方案在严格控制LD和Nd:YAG晶体工作温度的条件下,当单频Nd:YAG激光器的输出功率波动时,根据LD输出功率与其注入电流成正比这一变化规律,利用获得的功率误差信号反馈控制LD的注入电流,即可稳定单频Nd:YAG激光器的输出功率.实验结果表明:当LD泵浦1064 nm单频Nd:YAG激光器的输出功率约为11.5 mW时,采用所设计的控制系统,可使激光输出功率稳定性在130 min内优于1.3%.%The stability of laser output power is one of the important parameters to evaluate the laser performance. This paper introduced the operation principle and the structural features of a laser-diode (LD) end-pumped single-frequency Nd∶ YAG laser at 1 064 nm , analyzed the main factors that affected the stability of the Nd'YAG laser output power , proposed and experimentally studied a control scheme for stabilizing the Nd∶ YAG laser output power. Since the output power of the Nd∶YAG laser was proportional to the LD's injection current when the temperature of the LD and the Nd∶YAG crystal rod was stable, the control scheme strictly controlled the temperature of the LD and the Nd'YAG crystal rod, and the LD's injection current was adjusted through a negative feedback control system when the Nd∶YAG laser output power fluctuated. The experimental results indicated that when the output power of the LD-pumped single-frequency Nd∶YAG laser at 1 064 nm was about 11. 5 mW, the laser output power stability was better than 1. 3％ within 130 min using the designed control system.