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采用激光二极管(LD)泵浦c轴切割的Nd:GdVO4晶体,声光调制器作为主动调Q开关,GaAs饱和吸收体作为被动调Q开关,实现了声光-GaAs主被动双调Q、KTP内腔倍频0.53μm绿激光运转,获得了双调Q绿激光的平均输出功率、脉冲宽度、峰值功率与泵浦功率的依赖关系。为了比较单一声光主动调Q、GaAs被动调Q、声光-GaAs主被动双调Q激光脉冲波型的对称性,定义了脉冲前沿上升时间与脉冲后沿下降时间的比值为对称因子来描述脉冲波型的对称性,对称因子越接近1意味着脉冲的对称性越好。实验结果表明,与单一调Q激光相比,双调Q绿激光产生的脉冲波型前后沿更对称、脉冲宽度更窄、峰值功率更高。
Nd: GdVO4 crystal with c-axis cutting by laser diode (LD), acousto-optic modulator as active Q-switch, GaAs saturable absorber as passive Q-switch, The output power, pulse width, peak power and pump power of the dual Q-switched green laser were obtained. In order to compare the symmetry between active Q-switched, Q-switched passive Q-switched GaAs and active-active double-Q-switched Q-switched pulsed Q-switched GaAs, a symmetrical factor is defined as the ratio of pulse rising time to falling time Symmetry of the pulse pattern, the closer the symmetry factor to 1 means the better symmetry of the pulse. Experimental results show that, compared with a single Q-switched laser, the dual-Q Q-green laser produces more symmetrical pulse front and back edges with narrower pulse width and higher peak power.