亚波长光栅调制的偏振稳定垂直腔面发射激光器研究  

Polarization stable vertical-cavity surface-emitting laser with surface sub-wavelength gratings

作　　者：李硕[1] 关宝璐[1] 史国柱[1] 郭霞[1] 

机构地区：[1]北京工业大学,新型光子器件实验室,北京100124

出　　处：《物理学报》2012年第18期188-193,共6页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2006CB604902);国家自然科学基金(批准号:60908012)资助的课题~~

摘　　要：基于微光学技术设计得到了偏振稳定垂直腔面发射激光器结构,将亚波长光栅结构集成在上分布布拉格反射镜表面,光栅周期小于材料中光波长,透射波和反射波中仅包含零级衍射,避免了高级次衍射造成的损耗.集成光栅后不同偏振方向光阈值增益不同,从而实现偏振控制.实验结果显示,集成亚波长光栅结构后,整个激射过程中偏振方向被固定在平行于光栅槽方向上,获得偏振稳定激光输出,正交偏振抑制比大于12 dB,且阈值电流仅增大7.14%.By introducing sub-wavelength grating into an oxide-confined 980-nm vertical-cavity surface-emitting laser （VCSEL）, the VC- SEL with a stable polarization is realized. A sub-wavelength zero-order grating period is smaller than the wavelength in the semicon- ductor medium. This choice avoids a reduction in efficiency due to higher diffracting light. After the grating is etched, the threshold gains of E-fields parallel and perpendicular to the grating groves direction are different. The polarization therefore would be controlled. Good laser characteristics are obtained： the orthogonal polarization suppression ratio is over 12 dB and the threshold current increases just 7.14%.

关 键 词：垂直腔面发射激光器 亚波长光栅 偏振稳定 

分 类 号：TN248[电子电信—物理电子学]