中国激光, 2020, 47 (7): 0701025, 网络出版: 2020-07-10
高功率氮化镓基蓝光激光器 下载: 1948次特邀研究论文
High Power GaN-Based Blue Lasers
激光器 氮化镓 蓝光激光器 热退化 内部光学损耗 载流子注入效率 lasers gallium nitride blue lasers thermal degradation internal optical loss carrier injection efficiency
摘要
高功率氮化镓基蓝光激光器在激光显示、激光照明和材料加工等领域具有很大的应用前景。通过优化蓝光激光器p-AlGaN限制层的生长温度,抑制了量子阱热退化,通过优化量子阱结构,改善了载流子分布,研制出了高功率蓝光激光器。利用变腔面反射率法获得蓝光激光器的内部光学损耗为6.8 cm -1,载流子注入效率为90%。在脉冲工作条件下,蓝光激光器的阈值电流密度为1 kA/cm 2,斜率效率为1.65 W/A,预计在6 kA/cm 2电流密度下,输出光功率能达到4 W;在连续工作条件下,激光器的阈值电流密度为1 kA/cm 2,由于封装散热性能不佳,斜率效率下降为1 W/A,预计在6 kA/cm 2的电流密度下,输出光功率为2.2 W。
Abstract
High-power blue lasers based on gallium nitride (GaN) have significant prospects in numerous applications, such as laser display, laser lighting, and metal processing. In this study, the epitaxial growth temperature of the p-AlGaN cladding layer of blue lasers is optimized to suppress the thermal degradation of the quantum wells (QWs) and QW structures are optimized to improve the carrier distribution to achieve high-power blue lasers. Upon varying the front facet-coating reflectivity, the internal optical loss and carrier injection efficiency are deduced to be 6.8 cm -1 and 90%, respectively. Under pulsed operations, the threshold current density of the blue lasers is 1 kA/cm 2 and the efficiency gradient is 1.65 W/A. Thus, the expected output power is 4 W at a current density of 6 kA/cm 2. Under continuous-wave operations, the threshold current density of the blue lasers is 1 kA/cm 2 and the efficiency gradient drops to 1 W/A for poor packaging heat dissipation perform. Thus, the output power reaches 2.2 W at a current density of 6 kA/cm 2.
胡磊, 张立群, 刘建平, 黄思溢, 任霄钰, 田爱琴, 周伟, 熊巍, 李德尧, 池田昌夫, 杨辉. 高功率氮化镓基蓝光激光器[J]. 中国激光, 2020, 47(7): 0701025. Hu Lei, Zhang Liqun, Liu Jianping, Huang Siyi, Ren Xiaoyu, Tian Aiqin, Zhou Wei, Xiong Wei, Li Deyao, Ikeda Mason, Yang Hui. High Power GaN-Based Blue Lasers[J]. Chinese Journal of Lasers, 2020, 47(7): 0701025.