论文部分内容阅读
基于GaAs场效应管电压控制电流和开关的特性,设计了一种任意电脉冲发生器,并成功应用于激光脉冲整形装置。该电脉冲发生器利用超宽带窄脉冲触发多个GaAs场效应管,产生多路负脉冲,通过模拟延时线依次将各路负脉冲延迟一定时间后经微带线耦合输出多路负脉冲叠加的波形;通过多路不同幅度的脉冲堆积效应来获得形状任意可调的整形电脉冲。为了满足惯性约束聚变(ICF)实验中对电脉冲幅度不能过小的要求,在电路的输出端接入增益可调的超宽带电压放大器,使脉冲幅度达到实验要求。利用设计的任意电脉冲发生器实现了脉冲幅度0～5 V可调、脉宽0～10ns可调、时域调节精度为330 ps,整形方波脉冲下降沿为330 ps、上升沿为240 ps。实验结果表明,将产生的电脉冲注入光波导调制器,可获得理想形状的整形激光脉冲,提高激光脉冲的输出能量。
Based on GaAs FET voltage control current and switching characteristics, an arbitrary electric pulse generator is designed and successfully applied to laser pulse shaping device. The electrical pulse generator uses a plurality of GaAs FETs triggered by an ultra-wideband narrow pulse to generate a plurality of negative pulses, and sequentially delays the negative pulses by a delay line for a certain period of time after being coupled through the microstrip line to output a plurality of negative pulse superpositions Of the waveform; through a variety of different amplitude pulse stacking effect to obtain the shape of any shape adjustable electrical pulse. In order to meet the requirement that the amplitude of the electric pulse can not be too small in the ICF experiment, an adjustable gain UWB voltage amplifier is connected to the output of the circuit so that the pulse amplitude reaches the experimental requirement. The pulse amplitude is adjustable from 0 V to 5 V, the pulse width is adjustable from 0 to 10 ns, the time domain adjustment accuracy is 330 ps, the falling edge of the shaped square wave pulse is 330 ps, and the rising edge is 240 ps . Experimental results show that the pulse generated by the injection into the optical waveguide modulator can be shaped laser pulse of the desired shape to improve the laser pulse output energy.