摘要
基于固态平板传输线、同轴电缆、GaAs光导开关和激光二极管触发系统,设计了两种脉冲形成线电路结构,研究了激光二极管触发条件下的GaAs光导开关的导通特性:基于GaAs光导开关的固态Blumlein脉冲形成线可输出具有快前沿的高功率、窄脉冲电压;给出了测量光导开关抖动和导通电阻的方法,测得光导开关的抖动、导通电阻都随激光能量和充电电压的增大而减小,其最小抖动约0.12ns,导通电阻为欧姆量级;测得光导开关导通电流约250~300A(平板传输线特征阻抗Z0=25?),并探索了光导开关并联分流的可行性;测量出光导开关的导通时间约0.4~0.6ns,随工作次数的增多,导通时间逐渐增大。
Based on solid-state planar transmission lines, coaxial transmission lines, GaAs photoconductive semiconductor switches(PCSS) and laser diode triggers, two types of pulse forming lines were designed to study the on-state properties of GaAs PCSS triggered by laser diode. The solid-state Blumlein pulse forming lines based on GaAs PCSS could output a high-power pulse voltage with short duration and rising time. The methods of measurement about the time jitter and on-state resistance are presented, and both the time jitter and on-state resistance of GaAs PCSS decrease as the laser energy and input voltage increase. It is measured that the minimum switch's jitter is 0.12 ns, and on-state resistance is in an order of ohms magnitude. The on-state current of GaAs PCSS is about 250~300 A(Z0=25 ?), which can be shunted by using two GaAs PCSS in parallel. The on-state time is measured to be 0.4~0.6 ns, and increases with the shot accumulating.
引文
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