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

doi:10.1088/1674-1056/19/5/054208

中国物理B ›› 2010, Vol. 19 ›› Issue (5): 54208-054208.doi: 10.1088/1674-1056/19/5/054208

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

郭万红, 刘俊岐, 陆全勇, 张伟, 李路, 王利军, 刘峰奇, 王占国

Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083,China

收稿日期:2009-10-09 修回日期:2009-10-21 出版日期:2010-05-15 发布日期:2010-05-15
基金资助:
Project supported by the National Science Fund for Distinguished Young Scholars of China (Grant No.~60525406), the National Natural Science Foundation of China (Grant Nos.~60736031, 60806018, and 60906026), the National Basic Research Program of China (Grant No.~2006CB604903), and the National High Technology Research and Development Program of China (Grant Nos.~2007AA03Z446 and 2009AA03Z403).

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

Guo Wan-Hong(郭万红)^†, Liu Jun-Qi(刘俊岐)^‡, Lu Quan-Yong(陆全勇), Zhang Wei(张伟), Li Lu(李路), Wang Li-Jun(王利军), Liu Feng-Qi(刘峰奇), and Wang Zhan-Guo(王占国)

Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083,China

Received:2009-10-09 Revised:2009-10-21 Online:2010-05-15 Published:2010-05-15
Supported by:
Project supported by the National Science Fund for Distinguished Young Scholars of China (Grant No.~60525406), the National Natural Science Foundation of China (Grant Nos.~60736031, 60806018, and 60906026), the National Basic Research Program of China (Grant No.~2006CB604903), and the National High Technology Research and Development Program of China (Grant Nos.~2007AA03Z446 and 2009AA03Z403).

摘要/Abstract

摘要： A 7.8-$\mu $m surface emitting second-order distributed feedback quantum cascade laser (DFB QCL) structure with metallized surface grating is studied. The modal property of this structure is described by utilizing coupled-mode theory where the coupling coefficients are derived from exact Floquet--Bloch solutions of infinite periodic structure. Based on this theory, the influence of waveguide structure and grating topography as well as device length on the laser performance is numerically investigated. The optimized surface emitting second-order DFB QCL structure design exhibits a high surface outcoupling efficiency of 22{\%} and a low threshold gain of 10~cm$^{ - 1}$. Using a {$\pi $} phase-shift in the centre of the grating, a high-quality single-lobe far-field radiation pattern is obtained.

Abstract: A 7.8-$\mu $m surface emitting second-order distributed feedback quantum cascade laser (DFB QCL) structure with metallized surface grating is studied. The modal property of this structure is described by utilizing coupled-mode theory where the coupling coefficients are derived from exact Floquet--Bloch solutions of infinite periodic structure. Based on this theory, the influence of waveguide structure and grating topography as well as device length on the laser performance is numerically investigated. The optimized surface emitting second-order DFB QCL structure design exhibits a high surface outcoupling efficiency of 22% and a low threshold gain of 10 cm$^{ - 1}$. Using a $\pi $ phase-shift in the centre of the grating, a high-quality single-lobe far-field radiation pattern is obtained.

Key words: quantum cascade laser, Floquet--Bloch expansion, distributed feedback lasers, surface emission

中图分类号: (Semiconductor lasers; laser diodes)

42.55.Px

42.60.Lh (Efficiency, stability, gain, and other operational parameters) 42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)

郭万红, 刘俊岐, 陆全勇, 张伟, 李路, 王利军, 刘峰奇, 王占国. Design of surface emitting distributed feedback quantum cascade laser with single-lobe far-field pattern and high outcoupling efficiency[J]. 中国物理B, 2010, 19(5): 54208-054208.

Guo Wan-Hong(郭万红), Liu Jun-Qi(刘俊岐), Lu Quan-Yong(陆全勇), Zhang Wei(张伟), Li Lu(李路), Wang Li-Jun(王利军), Liu Feng-Qi(刘峰奇), and Wang Zhan-Guo(王占国). Design of surface emitting distributed feedback quantum cascade laser with single-lobe far-field pattern and high outcoupling efficiency[J]. Chin. Phys. B, 2010, 19(5): 54208-054208.

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

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

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