实现了激光二极管(LD)抽运Nd∶YVO4/KTP,GaAs饱和吸收体被动调Q绿激光运转。测量了GaAs不同厚度情况下的脉冲重复率、脉冲宽度、单脉冲能量及峰值功率随抽运功率的变化关系。在抽运功率3.22 W下,300 μm厚的GaAs获得了381 kHz的高重复率,53.2 ns的脉冲宽度,0.18 μJ的单脉冲能量。通过求解内腔倍频GaAs调Q工作原理的耦合波方程组,所得的理论值与实验结果相符。

By using GaAs saturable absorber, the running of a diode-pumped Q-switched intra-cavity frequency-doubled Nd∶YVO4/KTP laser is realized. The dependences of pulse width, pulse repetition rate, pulse energy and peak power on pump power are measured with different thickness of GaAs. At 3.22 W of pump power, the laser Q-switched by 300 μm GaAs produces 53.2 ns pulses at a pulse repetition rate of 381 kHz. The pulse energy is 0.18 μJ. The rate equations of intra-cavity frequency-doubling laser Q-switched by GaAs are introduced to analyze the experimental results. The numerical calculations of the rate equations are consistent with the experimental results.