在激光二极管抽运固体激光器(DPSSL)中设计一种由无刷电机驱动, 采用棱镜作为旋转反射镜的转镜Q开关。设计了20只棱镜的转盘, 获得重复频率14.3 kHz的激光脉冲, 实现了千赫兹高重复频率大功率关断能力的Q开关技术。在逐步提高转镜转速来缩短Q开关时间的实验中, 激光脉冲序列相应递减, 当棱镜转镜转速为4.3×104 r/min时, 获得脉宽89 ns, 重复频率14.3 kHz的1064 nm高重复频率脉冲输出。当输入功率为795 W时, 获得平均功率100 W脉冲输出, 电-光转换效率为12.5%, 峰值功率达到78.3 kW。实验结果说明, 棱镜转镜Q开关是实现全固态激光器千赫兹Q脉冲输出的可行技术途径之一。

A high speed spinning prism Q-switch driven by a brushless direct current (DC) motor (BLDC) has been designed with right-angle reflector in laser diode pumped solid state laser (DPSSL). Some laser pulse series disappear gradually and the number of the output pulses decreases gradually as decreasing the Q-switch shutting period with the increased spinning speed in the experiment, and as increasing the number of the prism to get to high pulse repetition rate, a spinning disk has been designed with 20 prisms, so at the spinning speed of 4.3×104 r/min, the minimum pulse duration is 89 ns, and the repetition rate is 14.3 kHz at the wavelength of 1064 nm. When the pumping power was 795 W, the output peak power of 78.3 kW was obtained at the repetition rate of 20 kHz, and the average output power of 100 W, electro-optic conversion of 12.5% were realized. The preliminary experimental results show that the spinning prism Q-switch as a feasible technology of kilohertz Q pulse plays an important turning-off-ability role in the high repetition rate and high-power DPSSL.