端面泵浦掺Yb^(3+)双包层光纤激光器

End-pumped Yb^(3+) doped double clad fiber laser

从双包层光纤激光器的速率方程出发,得到了光纤中泵浦光与激光的功率分布、输出功率与泵浦功率的关系、腔镜反射率及光纤长度对输出功率的影响。研究结果表明:输出激光功率与光纤长度及后腔镜反射率有很强的依赖关系,存在一个输出功率最大的最佳光纤长度。后腔镜反射率越大,输出激光功率越小;当光纤长度较短时,在输出端放置反射镜使泵浦光高反射,可以提高输出功率和效率。通过对端面泵浦掺Y b3+双包层光纤激光器进行理论分析和实验研究,得到输出激光的中心波长为1 088.3 nm,斜率效率为33.7%,最大输出功率为1.75 W。

Theoretical analysis and experiment of end-pumped Yb^3＋ doped double-clad fiber laser are presented in this paper. Based on rate equations, the distribution of pump power and laser power in the fiber, the effect of fiber length and reflectivity of cavity minor on output power are studied. The maximum output laser power can be obtained with the optimum fiber length and fiber end as output coupling. That is, the higher the reflectivity of rear-cavity mirror is, the lower the laser output power will be. For short fiber, the output laser power and slope efficiency can be improved when a reflective mirror is set at output end to reflect the pump light. In the experiment, the laser with a central wavelength of 1 088.3 nm, the slope efficiency of 33.7% and the maximal output power of 1.75 W were obtained.