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正切平方势阱中光学吸收系数的研究

, PP. 330-334

Keywords: 非线性光学,正切平方势阱,吸收系数,密度矩阵近似

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Abstract:

在量子力学框架内,利用正切平方势把电子的Schrodinger方程化为了超几何方程,并用超几何函数严格求解了电子的本征值和本征函数。利用量子力学中的密度矩阵算符理论导出了正切平方势阱中的线性与三阶非线性光学吸收系数的解析表达式。计算了该系统中的线性与非线性光学吸收系数的大小,讨论了影响吸收系数变化的因素。文章以典型的AlGaAs/GaAs势阱为例作了数值计算,数值计算结果表明,势阱的形状和入射光强对光学吸收系数的变化有着重要的影响。

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