光导开关非线性导通时的载流子累加效应

Carrier accumulation effect of nonlinear photoconductive semiconductor switches

利用半导体激光器作为触发源,对砷化镓光导开关进行了实验研究,重点研究了载流子累加效应对开关输出特性的影响。实验结果表明,光导开关的导通机制与内部载流子数的多少直接相关,当开关中的载流子数积累到雪崩碰撞电离条件,开关就会发生非线性导通。采用低能量光脉冲序列触发光导开关,获得了高功率输出,降低了开关非线性导通时的触发光能和偏置电压,对于光导开关的应用具有重要意义。

GaAs photoconductive semiconductor switches（PCSS）triggered by laser diode were studied experimentally.Our research has focused on the effect of carrier accumulation on output properties of PCSS.The results indicate that the operation mode of PCSS depends on the carrier number and avalanche will occur when carriers accumulate to a certain level.High power output was obtained when the PCSS is triggered by an optical pulse train.Because of the carrier accumulation effect,the work conditions,i.e.,the bias voltage and the optical energy,can be reduced.It is of importance to application of PCSS.