高重频Nd:YVO4声光调Q与RTP电光调Q激光器实验对比分析

报道了相同实验条件下激光二极管端面抽运生长型复合Nd:YVO4晶体声光调Q和RTP电光调Q激光器。应用声光调Q和RTP电光调Q分别实现了最高重复频率200 kHz和500 kHz的TEM00模1 064 nm激光输出，输出平均功率分别达到12.13 W和13.56 W，脉冲宽度分别为16.65 ns和27.27 ns，并首次对比了两种调Q体制下的高重频激光输出特性。实验结果表明，RTP电光调Q具有更好的高重频关断能力，但由于受到高压驱动的限制，RTP电光调Q无法在更高重复频率下实现窄脉宽高峰值功率激光输出，而在更高重频下仍有较好输出性能的声光调Q将取代电光调Q成为几百千甚至上兆Hz高重频激光器的首选调Q机制。

Experiment comparison of acousto-optical Q-switching and RTP electro-optical Q-switching of high repetition frequency Nd: YVO4 laser

A laser diode(LD) end-pumped adhesive-free bond composite Nd:YVO4 Acousto Optical(AO) Q-switched and RTP Electro Optical(EO) Q-switched laser were reported at the same experimental condition. TEM00 operation of 1 064 nm laser were obtained at repetition rate of 500 kHz in AO Q-switched regime and 200 kHz in EO Q-switched regime. And it was the first time to compare the output performance of AO Q-switched operation and RTP EO Q-switched operation at high repetition rate. In EO Q-switched regime, the average output power reached to 12.13 W with the pulse-width of 16.65 ns. In AO Q-switched regime, the average output power reached to 13.56 W with the pulse-width of 27.27 ns. The experimental results show that RTP EO Q-switched operation has better performance of turn-off. However, due to limitation of high voltage driver, EO Q-switched is not able to achieve with shorter pulse width and higher peak power laser under higher repetition rate operation. The AO Q-switched operation that has better output characteristic at higher repetition rate, and it would be the preferred method to obtain Q-switched laser which the repetition rate is high as thousands of hundreds and even mega.