Control system for stabilizing output power of diode-pumped single-frequency Nd∶YAG laser at 1 064 nm

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.