Zhang Zheng, Zhu Guangzhi, Li Zuoyun, Huang Junchi, Sun Shengkai, Zhu Xiao
Appl Opt. 2025 Jan 1;64(1):161-169. doi: 10.1364/AO.544932.
Acousto-optic Q-switched (AOQ-switched) lasers always suffer from having a laser pulse with a long tail and lower energy utilization. The ability of an acousto-optic modulator (AOM) to quickly program diffraction losses provides an effective method to solve these problems. In this paper, a six-temperature model is built to analyze the dynamical properties of the AOQ-switched laser with programmable control of the diffraction loss. The AOQ-switched laser pulse, or even the multi-pulse without a tail, can be achieved by precise adjusting of the delay time, pulse width, and pulse interval of the AOM control signal within a laser cycle. In the experiments, when the pulse width of the AOM control signal is reduced to 1 µs, the AOQ-switched laser pulse without the tail is obtained with a peak power of 1.36 kW and a pulse width of 132 ns at the repetition of 5 kHz. Meanwhile, equal energy double-pulse, triple-pulse, and quadruple-pulse lasers can be achieved by precisely programming the delay time and pulse interval of the AOM control signal. The average power has been significantly improved.
声光调Q（AOQ调Q）激光器总是存在激光脉冲拖尾长和能量利用率低的问题。声光调制器（AOM）快速设定衍射损耗的能力提供了一种解决这些问题的有效方法。本文建立了一个六温度模型来分析具有可编程衍射损耗控制的AOQ调Q激光器的动力学特性。通过在激光周期内精确调整AOM控制信号的延迟时间、脉冲宽度和脉冲间隔，可以实现AOQ调Q激光脉冲，甚至是无拖尾的多脉冲。在实验中，当AOM控制信号的脉冲宽度减小到1微秒时，获得了无拖尾的AOQ调Q激光脉冲，其峰值功率为1.36千瓦，脉冲宽度为132纳秒，重复频率为5千赫兹。同时，通过精确设定AOM控制信号的延迟时间和脉冲间隔，可以实现等能量双脉冲、三脉冲和四脉冲激光器。平均功率得到了显著提高。
