设计了一种并联双晶体高速快脉冲源，用于激光物理实验中预脉冲的高速削波。该削波脉冲源采用升压工作模式，由光电转换模块、高压电源模块、开关器件及电路等部分组成。光电转换模块将光信号转变为开关通断信号，用于控制高压脉冲输出；集成的高压电源模块和开关器件简化了电路设计，增加了该电源的可靠性；设计合理的开关电路和元件参数，保证稳定输出符合要求的高压脉冲波形。该快脉冲源的输出脉冲幅度大于4 000 V，下降沿小于10 ns，时间抖动小于1 ns，已成功用于激光物理实验预脉冲的削波。

A fast impulse source with parallel-double-crystal for optical clipping is developed, which is used in laser physical experiment to chop pre-pulse. The impulse source works in a voltage-increased mode, and consists of photoelectric conversion module, high voltage supply module and switching circuit. Photoelectric conversion module transforms the optical signal to switching signal for control outputting high voltage pulse; integrated high voltage supply module and switching component simplify the circuit design, enhance the reliability; the reasonable circuit and parameter design ensure outputting satisfactory high voltage pulse steadily. The impulse source outputs negative high voltage pulse with amplitude>4 000 V, falling edge<10 ns and time jitter<1 ns, which has been successfully applied to laser physical experiment to chop pre-pulse.