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.
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页数：3
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