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用波长为532nm、脉冲宽度为5ns的超短激光脉冲触发电极间隙为4mm的半绝缘GaAs光电导开关,开关偏置电压从500V开始以步长50V逐渐增加,直到开关出现非线性电脉冲输出.研究表明,线性和非线性电脉冲波形均呈现出在经历一个主脉冲之后,其后跟随几个幅值较小且具有周期性和不同程度的减幅振荡.分析了开关体内载流子(热电子)的微观状态和输运过程,在直流偏置电场作用下,开关体内的热电子在电子-电子、电子-声子相互作用过程中,当它们的弛豫时间大于载流子的寿命时,光电子的输运可通过迁移率变化引起光电导振荡,这是开关输出电脉冲出现振荡的原因.
The semi-insulating GaAs photoconductive switch with the wavelength of 532nm and the pulse width of 5ns is used to trigger the semi-insulating GaAs photoconductive switch whose gap is 4mm. The switching bias voltage is gradually increased from 500V to 50V in steps until the switch has non-linear electrical pulse output. It has been shown that both linear and nonlinear electrical pulse waveforms appear to undergo a main pulse followed by a few amplitude-reduced and periodic oscillations with varying degrees of oscillation.The effects of carrier Electrons) and transport process, under the action of DC bias electric field, when the relaxation time of the hot electron in the switch body is greater than the lifetime of the carrier during the electron-electron and electron-phonon interaction , Optoelectronic transport can cause photoconductive oscillations through changes in mobility, which is why oscillating electrical switching pulses appear.