【作者】 韩力英；

【导师】 张存善；

【作者基本信息】 河北工业大学 ， 微电子学与固体电子学， 2004， 硕士

【摘要】 垂直腔面发射激光器(VCSEL)较之传统的边发射激光器来说具有低阈值、单纵模工作、发散角小、动态调制频率高、易实现二维集成等优点，在光通信、光互联、图象信号处理等方面有着重要的应用前景；由于VCSEL是面发射并且器件结构一般为圆对称结构，所以材料增益和波导各向异性效应大大降低，输出光一般为椭圆偏振光，并且偏振的稳定性远不如边发射激光器。 本文从理论和实验上对VCSEL的偏振特性进行了研究，具体工作可以概括如下： 1．通过四能级偏振动力学模型，在不考虑外加应变以及温度的前提下，对Maxwell-Bloch方程进行数值求解，研究了随着注入电流以及各向异性的变化引起的VCSEL的出射偏振光的强度、频率和相位变化。 2．研究了外加应变、温度对各向异性、偏振频率以及相位的影响。 3．通过实验测量了VCSEL的出射偏振光随着注入电流的变化。 结果表明影响VCSEL输出光偏振不稳定性的因素是各向异性效应和注入电流。理论上得出了随着注入电流的增加，偏振光发生变化；实验上测量出了随着注入电流的增加，偏振光的方向发生变化的过程。更多还原

【Abstract】 Vertical-cavity surface-emitting lasers (VCSEL) have distinct advantage over conventional edge emitting lasers. They are especially suitable for optical communication systems, optical interconnects, parallel optical signal processing. In VCSEL, the material gain and wave guide anisotropy are considerably reduced because of their cylindrical symmetry and their surface-emitting. So lead to their polarization behavior not as good as edge lasers. The paper researched the polarization of VCSEL theoretically and experimentally, the main work is as follows:Part Ⅰ.Without consideration the applied strain and temperature, we resolved numerically the Maxwell-Bloch equation through four-energy level polarized dynamic model. And we studied the intensity of emergent polarized light , frequency , phase variation about VCSELcaused by the injection current and anisotropic change.The paper demonstrates that the output light occurs polarization switching as the increasing of the injection current theoretically and experimentally.Part Ⅱ. We studied the influence of applied strain and temperature on the anisotropicproperty , polarized frequency and the phase.Part Ⅲ. We measured experimentally the change of emergent polarized light cause by injection current.The result showed that the unstable factors of VCSEL’s emergent polarized light are anisotropic effect. We deduced theoretically that the polarized light change with the increase of injection current and measured experimentally the process of polarized light’s direction change with the injection current.更多还原