基于偏振测量的VCSEL激光器阈值行为研究

摘要

设计构建了垂直腔面发射激光器偏振测试系统，利用该测试系统研究了激光器不同偏振模式的阈值行为特点。激光器的输出光随着驱动电流的增大将会出现P偏振以及S偏振两种相互正交的偏振分量，并且两者具有不同的工作阈值；进一步依据测得的阈值点将激光器分为三个工作区域，通过对非偏振及偏振测试结果的比较分析得出：垂直腔面发射激光器的非偏振测量中观测到的工作阈值点体现的是P偏振分量的阈值点；激光器S偏振分量的阈值需要通过偏振测量才能明显观测到；P偏振与S偏振分量阈值电流之间的工作区域具有最好的线偏振度。本文的研究为垂直腔面发射激光器的未来研制测试工作和更好应用夯实了基础。%The polarization test system for a vertical cavity surface emitting laser(VCSEL)is designed. With this test system,the threshold behaviors of VCSEL are studied. With the increase of driven current,two orthogonal polarization states are observed and their thresholds are different. According to the thresholds,the working region of the laser is di-vided into three parts. The analysis based on the non-polarization and polarization experimental results show that the threshold of the experimental curve from the non-polarization measurements is the threshold of P-polarized light;the threshold of the S-polarized light of the laser is observed obviously with polarization measurements;In the working re-gion between the thresholds of P-polarized and S-polarized light,the degree of the linear polarization is higher than other working regions. The studies of this paper set the steady basis for further researches,test,and applications of a vertical cavity surface emitting laser.