摘要
大模场面积(LMA)光纤激光器的光束质量通常比单模光纤激光器的光束质量差。采用光纤拉锥的方法进行模式选择,从而提高大模场直径光纤激光器的光束质量。拉锥区距光纤激光器的输出端约5 mm,纤芯最小为9μm,约为未拉锥部分纤芯直径26μm的1/3。实验研究表明,在拉锥后,光纤激光器的光束质量因子M2由3.50减小为1.81,相应的斜率效率由63.6%减小为51.1%。虽然拉锥后最大输出功率减少了约19.8%,但其亮度增大为拉锥前的3倍。
For large-mode-area (LMA) fiber laser, the beam quality is not as good as that of single mode fiber laser. A tapered section was introduced to a LMA fiber. The core diameter of the smallest part was 9μm, which was located 5 mm away from the output end of the fiber and about three times smaller than the conventional fiber core with the diameter of 26μm. The experimental results show that the beam quality factor Me is reduced from 3.50 to 1.81, with the slope efficiency from 63.6% to 51.1%. Although the tapering induces 19.8% power loss, the brightness of the tapered fiber laser is 3 times as much as that of the untapered.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2007年第12期1625-1628,共4页
Chinese Journal of Lasers
基金
国家重大基础研究资助项目