LIGHT-POLARIZATION DYNAMICS IN SURFACE-EMITTING SEMICONDUCTOR-LASERS
LIGHT-POLARIZATION DYNAMICS IN SURFACE-EMITTING SEMICONDUCTOR-LASERS
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DOI：
10.1103/physreva.52.1728
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发表时间：
1995-08-01
影响因子：
2.9
通讯作者：
MOLONEY, JV
中科院分区：
文献类型：
--
作者：
SANMIGUEL, M;FENG, Q;MOLONEY, JV
一个四能级模型，考虑到激光场的偏振，包括自旋子级的半导体的导带和价带，使我们能够引入矢量速率方程，占激光发射的偏振自由度。分析这些速率方程及其扩展，包括横向自由度提供了重要的物理洞察的性质，偏振不稳定性的表面发射半导体激光器。在没有横向效应的情况下，该模型预测了一个边缘稳定的线性偏振态。极化自由度的动态响应的类型与自发发射和自旋弛豫过程的相对时间尺度有关。考虑到横向效应，我们预言了在横向平面内存在稳定的横向空间均匀强度输出，且具有任意方向的线偏振。长波长扰动的离轴发射解决方案的稳定性进行了研究，除了埃克豪斯不稳定性与全球相关联，我们预测的复杂的持有矢量的相对相位相关的偏振不稳定性。相位各向异性在激光腔中的作用接近阈值进行了探讨，我们预测，它稳定两个优选的正交方向的偏振，然而，在其稳定性的横向效应的歧视。
A four-level model which takes account of the polarization of the laser field by including the spin sublevels of the conduction and valence bands of a semiconductor allows us to introduce vector rate equations which account for the polarization degree of freedom of the laser emission. Analysis of these rate equations and their extension to include transverse degrees of freedom provides important physical insight into the nature of polarization instabilities in surface-emitting semiconductor lasers. In the absence of transverse effects the model predicts a marginally stable linearly polarized state. The type of dynamical response of the polarization degrees of freedom is linked to the relative time scale of spontaneous-emission and spin-relaxation processes. With transverse effects included, we predict the existence of stable transverse spatially homogeneous intensity outputs with arbitrary direction of linear polarization in the transverse plane. The stability of the off-axis emission solutions to long-wavelength perturbations is investigated and, in addition to an Eckhaus instability associated with a global phase, we predict a polarization instability associated with a relative phase of the complex held vector. The role of phase anisotropy in the laser cavity is explored close to threshold and we predict that it stabilizes two preferred orthogonal directions of polarization, which, however, are discriminated in their stability properties by transverse effects.