介绍了激光二极管（LD）端面泵浦1 064 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1 064 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.