Study On The Generation Of Sub-nanosecond Elect-Ric Pulses By LD-triggered GaAs PCSS In High-gain Working Mode

Switch is the core device in pulsed power systems.Compared with the traditional pure electric switches,the GaAs PCSS have advantages of high repetition frequency,fast response speed,good photoelectric insulation,small jitter,simple structure,and so on.In general,GaAs PCSS have two modes of operation:linear mode and high-gain mode.In the high-gain mode,GaAs PCSS generate 103～105 electron-hole pairs for each photon absorbed,in which makes it possible for weak light to trigger GaAs PCSS to generate strong current pulses.However,in the mode,the pulse width of the output electrical pulse is extended due to the existence of the lock-on phenomenon,limits the application of GaAs PCSS in many fields.Therefore,researchers have been hoping to quench the high-gain mode of the GaAs PCSS to obtain an ultra-short electrical pulse.Based on above,the main works on this paper are as follows:(1)Using a microstrip line as the energy storage device and a small volume of laser diode(LD)as the trigger source to build an ultra-fast electric pulse generation system,and making the system work in high-gain mode under low light(4.75 μJ)triggering steadily.This will greatly reduce the size and cost of the entire system.(2)By adjusting experimental condition including the switching parameters,the bias voltage and the structure of the energy storage microstrip line,an ultra-short electric pulse with a minimum pulse width of 622.59 ps is realized at a bias voltage of 9 kV.The results break the limit of the output pulse width by the characteristic time(2 ns)of the microstrip line and trigger laser pulse width(23 ns).Compared with the previous reports in the literature,the result of this study is the shortest electrical pulse output by the GaAs PCSS in high-gain mode currently.(3)Theoretically,using the transmission reflection,impedance matching,optically activated charge domain and high-gain quenching mode of GaAs PCSS to explain the parameters of the output electrical pulse qualitatively.Indicating the reason why the shortest pulse width is different from the design eigenvalue.And comparing the similarities and differences between capacitor energy storage and transmission line energy storage...