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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。
Aiming at the characteristics of high speed of electro-optic Q-switch, the design method of high-voltage Q-switched Q-driving circuit based on Marx generator is proposed. The use of high-voltage module to produce a high-voltage parallel capacitor charging, the use of transformer isolation drive 8 MOS tube. When the trigger signal is introduced, the power MOSFET turns on to discharge the capacitor in series at the same time, so that the voltage is doubled to obtain a fast high voltage pulse. The experimental results show that the digitally adjustable high voltage pulse waveform with a rising edge of 12 ns and amplitude of 3 000 ~ 4 000 V is obtained by this method. Compared to the traditional pulse transformer waveform, the rise time is reduced by nearly 35 ns. This Q-adjusting circuit has been applied to a solid-state Nd: YAG laser pumped by a laser diode (LD), and operates stably over a long period of time.