中国激光, 2009, 36 (s1): 48, 网络出版: 2009-06-18
瓦级980 nm掺镱单模光纤激光器理论及实验研究
Theoretical and Experimental Investigation of over 1 W Single-Mode Yb-Doped Fiber Laser at 980 nm
激光器 光纤激光器 准三能级 单模掺镱光纤 倍频 lasers fiber laser quasi-three-level single-mode Yb-doped fiber frequency doubling
摘要
从速率方程出发, 得出准三能级掺镱光纤激光器的输出功率、斜率效率、抽运阈值功率和最佳光纤长度的表达式, 并理论分析了掺镱光纤激光器中的准三能级和四能级增益关系, 为抑制四能级起振和确定光纤长度范围提供理论依据。实验中采用光纤端面直接作为腔镜的平平腔结构, 当光纤长度为36.5 cm时, 入纤抽运光功率为2 W时, 最终获得两端总输出功率为1.32 W的980 nm单模激光输出, 总斜率效率达到75.3%, 实验结果与理论数值模拟结果相符, 对应的光光转换效率为66%(从入纤946 nm抽运光到980 nm激光输出)。另外, 980 nm激光经过BIBO晶体倍频后得到总功率为15 mW的490.8 nm蓝绿光输出, 倍频转换效率为1.1%。
Abstract
Based on rate equations, this paper gives expressions of the output power, the pump power threshold, the slope efficiency, and the fiber optimal length of the quasi-three-level Yb-doped fiber laser. The laser gain relationship between quasi-three-level mode and four-level mode in Yb-doped fiber laser is also given, which provides a theoretical basis for suppressing the four-level transmissions and determining the range of the fiber length. In the experiment, a plano-plano cavity consisting of two 0° fiber ends is adopted as cavity mirrors. A quasi-three-level Yb-doped single-mode fiber laser totally emitted 1.32 W of single-mode laser output at 980 nm from two ends with the slope efficiency of 75.3% when the fiber length is 36.5 cm. The corresponding optical conversion efficiency is 66% from incidence pump power at 946 nm to the laser power at 980 nm. Besides, a total power of 15 mW at 490.8 nm is obtained by frequency doubling the laser at 980 nm with BIBO with the conversion efficiency of 1.1%.
邹淑珍, 李平雪, 王凌昊, 陈檬, 李港. 瓦级980 nm掺镱单模光纤激光器理论及实验研究[J]. 中国激光, 2009, 36(s1): 48. Zou Shuzhen, Li Pingxue, Wang Linghao, Chen Meng, Li Gang. Theoretical and Experimental Investigation of over 1 W Single-Mode Yb-Doped Fiber Laser at 980 nm[J]. Chinese Journal of Lasers, 2009, 36(s1): 48.