1. Blue-Violet Lasing of Optically Pumped GaN-Based Vertical Cavity Surface-Emitting Laser With Dielectric Distributed Bragg Reflectors
- Author
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Baoping Zhang, Li-E Cai, Qiming Wang, Du-Xiang Wang, Feng Lin, Shui-Qing Li, Jinzhong Yu, Ke-Chuang Lin, Jiang-Yong Zhang, and Jing-Zhi Shang
- Subjects
Materials science ,business.industry ,Dielectric ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Vertical-cavity surface-emitting laser ,Semiconductor laser theory ,Optical pumping ,Laser linewidth ,Optics ,Distributed Bragg reflector laser ,law ,Optoelectronics ,business ,Lasing threshold - Abstract
Optically pumped GaN-based vertical cavity surface-emitting laser (VCSEL) with two Ta2O5/SiO2 dielectric distributed Bragg reflectors (DBRs) was fabricated via a simplified procedure: direct deposition of the top DBR onto the GaN surface exposed after substrate removal and no use of etching and polishing processes. Blue-violet lasing action was observed at a wavelength of 397.3 nm under optical pumping at room temperature with a threshold pumping energy density of about 71.5 mJ/cm2. The laser action was further confirmed by a narrow emission linewidth of 0.13 nm and a degree of polarization of about 65%. The result suggests that practical blue-violet GaN-based VCSEL can be realized by optimizing the laser lift-off technique for substrate removal.
- Published
- 2009
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