设计了基于电子自旋弛豫的透射式全光开关模型,该光开关具有开关时间短、结构简单、光学非线性强等特点。研究在右旋圆偏振光抽运下GaAs/AlGaAs半导体多量子阱(MQWs)中以相空间填充(PSF)和库仑屏蔽(CS)为主要因素导致的激子吸收饱和行为,计算与抽运光同向(探测光与抽运光的圆偏振方向相同)和反向(探测光与抽运光的圆偏振方向相反)的圆偏振探测光吸收系数的变化,得到两种圆偏振光差分透射率改变量随延迟时间的变化。实验采用飞秒抽运-探测技术,获得了室温下GaAs/AlGaAs多量子阱同向圆偏振探测光的透射曲线,观察到了明显的饱和吸收现象,与数值模拟的结果相符。 A transmissive all-optical switch model based on electron spin relaxation is designed. The switch has the characteristics of short switching time, simple structure and strong optical nonlinearity. The exciton absorption saturation behavior caused by phase space filling (PSF) and Coulomb shielding (CS) in GaAs / AlGaAs semiconductor MQWs under right-handed circularly polarized light pumping is studied. (The same as the circular polarization direction of the probe light and the pump light) and the circular polarization of the reverse direction (the probe light is opposite to the circular polarization direction of the pump light) to detect two types of circularly polarized light differential transmittance Change the amount of change with the delay time. The experiment uses the femtosecond pumping-detection technique to obtain the transmission curve of the GaP / AlGaAs multiple quantum well detection with the same direction of circular polarization at room temperature. The obvious saturation absorption phenomenon is observed, which is in good agreement with the numerical simulation.