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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.
High repetition rate, narrow pulse width all-solid-state laser seed-cascaded fiber amplifier is an effective way to obtain high-power pulsed laser output. Nd: YVO4 crystal with short on-state lifetime can be used in continuous pumping and high repetition frequency Q-switching operation It is easy to obtain the average output power near the continuous performance.The main factors influencing the output energy and the pulse width in the acousto-optic (AO) Q-switched device are theoretically analyzed and the cavity parameters are optimized.The laser diode (LD) The Nd: YVO4 crystal was pumped and the laser output of 1064 nm was achieved with the acousto-optic Q-repetition frequency of more than 100 kHz and the pulse width of 20 ns, and the pulse width of 15.3 ns was obtained at a repetition rate of 5.7 W The seed light output of 150 kHz, after cascading a single stage fiber amplifier, gives a 20 W output.