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Poschl-Teller势阱中二次谐波产生系数的计算

Optical Secong-Harmonic Generation in the Poschl-Teller Well

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摘要

二阶非线性光学效应是非线性光学中人们发现最早,研究最多,应用最广的一个课题.在非对称性势阱中,二次谐波产生系数与势阱的形状及其非对称性程度有很大的关系.本文用量子力学中密度矩阵算符理论导出了P(o)schl-Teller势阱中二次谐波产生系数和解析表达式.考虑到在P(o)schl-Teller势阱中有两个可调参数κ和λ,并且势阱的形状与对称性随κ和λ取值的不同而明显不同,因此我们可以通过调节κ和λ的取值而获得P(o)schl-Teller势阱中的二次谐波产生系数的变化规律,并找到其最大值,从而为实验提供必要的研究方向与理论依据.

Abstract

Nonlinear optics of low-dimensional semiconductor structures has recently attracted considerable attention. The problem is very important to the development of super-lattice devices such as fast infrared detectors and modulators because one needs to know the range of input optical intensities for which linear operation is possible. Analytical expression of the second-harmonic generation (SHG) coefficients is obtained in the Poschl-Teller well using the density matrix formalism taking into account the intrasubband relaxation. Since there are two adjustable parameters K and A in the Poschl-Teller well, the shape of the well will change with the change of the parameters K and A, accordingly the SHG coefficient will change with the parameters K and A. It is shown that the SHG coefficient depends on the parameter K , A and the tunnel bandwith. Numerical results are presented for a typical AlGaAs/GaAs Poschl-Teller well.

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中图分类号:O437.1

所属栏目:非线性光学

基金项目:广东省教育厅自然科学研究基金(202069)

收稿日期:2002-12-11

修改稿日期:2003-03-17

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作者单位    点击查看

谭鹏:佛山科学技术学院理学院物理系,佛山,528000
李斌:佛山科学技术学院理学院物理系,佛山,528000
路洪:佛山科学技术学院理学院物理系,佛山,528000
郭康贤:广州大学理学院物理系,广州,510405

联系人作者:谭鹏(tanpeng@foshan.net)

备注:谭鹏(1974-);男;毕业于广州大学物理系;获理学硕士学位.主要从事低维量子系统非线性光学效应的研究.现在广东佛山科学技术学院物理系从事教学与科研工作.E-mail:tanpeng@foshan.net

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引用该论文

谭鹏,李斌,路洪,郭康贤. Optical Secong-Harmonic Generation in the Poschl-Teller Well[J]. Chinese Journal of Quantum Electronics, 2003, 20(6): 661-665

谭鹏,李斌,路洪,郭康贤. Poschl-Teller势阱中二次谐波产生系数的计算[J]. 量子电子学报, 2003, 20(6): 661-665

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