Design of surface emitting distributed feedback quantum cascade laser with single-lobe far-field pattern and high outcoupling efficiency

被引：0
|
作者：
郭万红 [1 ]
刘俊岐 [1 ]
陆全勇 [1 ]
张伟 [1 ]
李路 [1 ]
王利军 [1 ]
刘峰奇 [1 ]
王占国 [1 ]
机构：
[1] Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences
来源：
Chinese Physics B | 2010年 / 19卷 / 05期
基金：
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词：
quantum cascade laser; Floquet-Bloch expansion; distributed feedback lasers; surface emission;
D O I：
暂无
中图分类号：
TN248 [激光器];
学科分类号：
摘要：
A 7.8-μm surface emitting second-order distributed feedback quantum cascade laser(DFB QCL) structure with metallized surface grating is studied.The modal property of this structure is described by utilizing coupled-mode theory where the coupling coefficients are derived from exact Floquet-Bloch solutions of infinite periodic structure.Based on this theory,the influence of waveguide structure and grating topography as well as device length on the laser performance is numerically investigated.The optimized surface emitting second-order DFB QCL structure design exhibits a high surface outcoupling efficiency of 22% and a low threshold gain of 10 cm 1.Using a π phase-shift in the centre of the grating,a high-quality single-lobe far-field radiation pattern is obtained.
引用
收藏
页码：324 / 330
页数：7
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