采用高功率975 nm多模半导体激光器(LD)作为抽运源, 以大模场掺Yb3+双包层光纤(YDCF)作为激光增益介质, 运用能够承受较高功率运行的利特罗(Littrow)光栅外腔调谐结构, 实现了宽带可调谐激光输出。实验中, 双包层光纤采用最优光纤长度14 m, 光栅经仔细调整后有效入纤反馈效率约20%, 当入纤抽运功率约1.3 W时, 激光器达到阈值并开始振荡。通过连续旋转光栅, 激光输出波长能在1046～1121 nm之间实现可调谐, 可调范围达75 nm。当入纤抽运功率为48 W时, 在1089 nm波长处获得最大输出功率23.7 W, 相应斜率效率为53%。最后, 基于数值模拟简单地分析了激光输出特性, 实验结果与数值模拟结果基本保持一致。
激光器 光纤激光器 调谐 双包层光纤
Author Affiliations
Abstract
Department of Electronic Engineering, Xiamen University, Xiamen 361005
A highly efficient cascaded P-doped Raman fiber laser (RFL) pumped by a 1064-nm continuous wave (CW) Nd:YVO3 solid-state laser is reported. 1.15-W CW output power at 1484 nm is obtained while the input pump power is 4 W, corresponding to the power conversion efficiency of 28.8%. The threshold pump power for the second-order Stokes radiation is 1.13 W. The slope efficiency is as high as 42.6%. The experimental results are in good agreement with theoretical ones. Furthermore, the power instability of the P-doped RFL at 1484 nm in an hour is observed to be less than 5%.
级联掺磷拉曼光纤激光器 掺钕钒酸钇激光器 1484 nm 1064 nm 140.0140 Lasers and laser optics 140.3550 Lasers, Raman 140.3580 Lasers, solid-state Chinese Optics Letters
2008, 6(1): 0141
