期刊
CHINESE OPTICS LETTERS
卷 20, 期 3, 页码 -出版社
OSA-OPTICAL SOC
DOI: 10.3788/COL202220.031402
关键词
GaN-based VCSEL; hole injection; laser power; modulation response
类别
资金
- National Natural Science Foundation of China [62074050, 61975051]
- Natural Science Foundation of Hebei Province [F2020202030]
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology [EERI_PI2020008]
- Joint Research Project for Tunghsu Group and Hebei University of Technology [HI1909]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515111053]
This work proposes GaN-based VCSELs with the p-AlGaN/p-GaN structure to enhance the laser power. The p-AlGaN/p-GaN heterojunction can store electric field and adjust the drift velocity and kinetic energy of holes, improving the thermionic emission process. Additionally, by using the p-AlGaN layer, the valence band barrier height in the p-EBL can be reduced, leading to better stimulated radiative recombination rate and increased laser power.
The hole injection capability is essentially important for GaN-based vertical cavity surface emitting lasers (VCSELs) to enhance the laser power. In this work, we propose GaN-based VCSELs with the p-AlGaN/p-GaN structure as the p-type hole supplier to facilitate the hole injection. The p-AlGaN/p-GaN heterojunction is able to store the electric field and thus can moderately adjust the drift velocity and the kinetic energy for holes, which can improve the thermionic emission process for holes to travel across the p-type electron blocking layer (p-EBL). Besides, the valence band barrier height in the p-EBL can be reduced as a result of usage of the p-AlGaN layer. Therefore, the better stimulated radiative recombination rate and the increased laser power are obtained, thus enhancing the 3 dB frequency bandwidth. Moreover, we also investigate the impact of the p-AlGaN/p-GaN structure with various AlN compositions in the p-AlGaN layer on the hole injection capability, the laser power, and the 3 dB frequency bandwidth.
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