高重复频率、窄脉宽的全固态激光器种子源级联光纤放大器是获得高功率脉冲激光输出的有效手段。短上能态寿命的Nd∶YVO4晶体在连续抽运、高重复频率Q开关工作时容易得到接近连续性能的平均输出功率。理论分析了声光(AO)调Q器件中影响输出能量和脉宽大小的主要因素,优化配置了腔型参数。利用激光二极管(LD)光纤耦合模块端面抽运Nd∶YVO4晶体,实现了声-光调Q重复频率100 kHz以上,脉宽20 ns以下,波长1064 nm的激光输出。在抽运功率5.7 W时,得到了脉宽15.3 ns,重复频率150 kHz的种子光输出,在级联单级光纤放大器后,得到了20 W的输出。

Cascaded fiber amplifier with high repetition rate, short pulse-width all-solid-state laser seed can achieve high output power. The average output power that is close to continuous wave (CW) performance is easily achieved for CW-pumped, high-repetitively Q-switched Nd∶YVO4 laser. The major factors influencing the pulse energy and pulse-width in acousto-optic (AO) Q-switched laser are analyzed, and the resonance parameters are optimized. The Nd∶YVO4 laser end-pumped by a fiber-coupled laser diode (LD) is reported, and A-O Q-switched 1064 nm laser with repetition rate larger than 100 kHz and pulse-width shorter than 20 ns is achieved. At the pump power of 5.7 W, laser seed with pulse width of 15.3 ns and pulse repetition rate of 150 kHz is acquired. The final output power of 20 W is achieved with the fiber amplifier.