运用量子力学密度矩阵算符理论,推导出在一种特殊非对称量子阱中的光整流系数的解析表达式.最后利用典型的GaAs/AlGaAs非对称量子阱进行数值计算,得到了系统的非线性光整流效应和量子阱的非对称性以及入射光子能量之间的变化规律,并在此特殊量子阱中得到了较大的光整流系数,从而为实验上制作较好的非线性材料提供了一种可行的途径.

Nonlinear optical rectification in a special asymmetric parabolic quantum well is studied by density-matrix methods, and the analytical expression of optical rectification coefficient is derived. Finally, the numerical results are presented for a typical GaAs/AlGaAs asymmetric quantum well. The variation rules between rectification coefficient and the asymmetry of quantum well, the incident photon energy are obtained. The larger rectification coefficient was obtained in this special quantum well. This is a feasible way to get fine nonlinear materials in experiment.