基于Marx发生器的快速Q开关驱动电路设计

针对电光Q开关要求速度快的特点，提出基于Marx发生器的高压快速调Q驱动电路的设计方法。利用高压模块产生一级高压为并联电容充电，采用变压器隔离驱动8路MOS管。当触发信号引入时，功率MOS管导通使电容串联同时放电，从而电压倍增获得快速的高压脉冲。实验结果表明:通过该方法获得了上升沿12 ns，幅值3 000~4 000 V数字可调的高压脉冲波形。相比于传统脉冲变压器法的波形，上升时间减小了近35 ns。此调Q电路已应用于激光二极管（LD）泵浦的固体Nd:YAG激光器中，且长期稳定工作。

Design of high speed Q-switch drive circuit based on Marx generator

Aiming at the characteristics of high speed for Q-switch, a novel design method of high speed Q-switch drive circuit based on Marx generator was proposed. The high pressure module was used to generate high voltage to charge the capacitors in parallel, and the transformer was used to drive 8 MOS transistors. When the trigger signal arrived, meanwhile the capacitors discharge in series as the MOS transistors were in ON-state, so that a higher voltage pulse can be obtained as the voltage multiplier. Experiment results show that the rise time of Q-switch pulse is about 12 ns,voltage magnitude is 3 000-4 000 V. Compared to the wave of traditional pulse transformer, the rise time minish 35 ns.The Q-switched module has already been used in the laser diode (LD) pumped solid Nd:YAG laser, and it works steadily and chronically.