腔倒空技术是一种有效产生大能量、短脉冲激光输出的调Q技术，其产生的Q开关激光脉冲的宽度主要由谐振腔腔长决定。大孔径半绝缘GaAs光电导开关(PCSS)是一种可耐高压的光控开关，具有响应速度快、时间抖动小、耐压高、暗电阻大、导通电阻小等特点，将其直接作为控制腔倒空激光器的光反馈回路和高电压开关，在腔长为20 cm的氙灯抽运Nd:YAG电光调Q激光器上实现了激光波长1064 nm、单脉冲能量15 mJ、脉冲半峰全宽 （FWHM）为1.7 ns的腔倒空激光脉冲稳定输出，脉冲宽度峰峰值抖动优于7%，能量峰峰值抖动优于3%。

Cavity dumping is an effective technique for generating Q-switched laser pulses of relatively large energy and extremely short time duration, and the width of Q-switched pulses is primarily a function of the oscillator cavity length. The solid state lateral semi-insulating GaAs photoconductive semiconductor switch (PCSS) has the unique ability to handle high power at very fast response time with very little timing jitter. A novel and effective technique of cavity dumping laser for generating short Q-switched laser pulses with a GaAs PCSS is presented. In a flashlamp pumped Nd:YAG laser with 20 cm long stable resonator, 1.7 ns short laser pulses have been obtained, and the pulse to pulse duration instability is less than 7% and energy instability is less than 3%.