Single-mode surface-emitting distributed feedback quantum-cascade lasers based on hybrid waveguide structure

被引：4

作者：

Guo, Wanhong ^{[1
]}

Liu, Junqi ^{[1
]}

Chen, Jianyan ^{[1
]}

Li, Lu ^{[1
]}

Wang, Lijun ^{[1
]}

Liu, Fengqi ^{[1
]}

Wang, Zhanguo ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Semicond, Key Lab Semicond Mat Sci, Beijing 100083, Peoples R China

来源：

CHINESE OPTICS LETTERS | 2011年 / 9卷 / 06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：

Coupling strengths - Distributed feedback - Hybrid waveguides - Second order gratings - Side mode suppression ratios - Single mode operation - Slope efficiencies - Surface emitting;

D O I：

10.3788/COL201109.061404

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Surface-emitting distributed feedback quantum-cascade lasers operating at lambda approximate to 7.8 mu m are demonstrated. The metal-covered second-order grating is shallow-etched into the surface of a thin InGaAs contact and cladding layer. This forms a hybrid waveguide and used to achieve relatively low waveguide losses and high coupling strengths. The devices exhibit stable single-mode operation from 90 to 130 K with a side mode suppression ratio above 20 dB. A slope efficiency of 194 mW/A is obtained at 90 K, which is twice higher than that of the Fabry-Perot counterpart.

引用

页数：3

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