Ridge width effect on comb operation in terahertz quantum cascade lasers

被引：22
|
作者：
Zhou, K. [1 ,2 ]
Li, H. [1 ,2 ]
Wan, W. J. [1 ]
Li, Z. P. [1 ,2 ]
Liao, X. Y. [1 ,2 ]
Cao, J. C. [1 ,2 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Key Lab Terahertz Solid State Technol, 865 Changning Rd, Shanghai 200050, Peoples R China
[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2019年 / 114卷 / 19期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
DISPERSION COMPENSATION; COMPRESSION; PAIRS; THZ;
D O I：
10.1063/1.5090788
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We systematically investigate the laser ridge width effect on comb operation of single plasmon waveguide quantum cascade lasers emitting around 4.2THz. The total group velocity dispersion (GVD), including the gain, waveguide, and material dispersions, is numerically evaluated for 6-mm long lasers with ridge widths varying from 100 to 200m. The simulation reveals that although calculated waveguide GVDs of lasers with different ridge widths are almost identical, the clamped gain dispersion partially determined by the frequency-dependent waveguide loss strongly contributes to the total GVD. From the simulation, we find that the laser with a 150-m-wide ridge shows the flattest total GVD in the lasing range between 4.05 and 4.35THz. The optimal ridge width of 150m for comb operation is also experimentally verified by intermode beat note and on-chip dual-comb measurements.
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收藏
页数：5
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