摘要
为克服光纤非线性效应和光纤损伤等对光纤激光功率增长的限制,高功率增益光纤通常采用大模场光纤结构。总结了目前大模场光纤实现的3条主要技术途径:光纤结构设计、模式选择控制和模式转换,说明各种技术途径的基本思想及主要光纤的特点,在此基础上,指出:这些方法真正应用到实际还面临着模场畸变、高阶模抑制、光纤激光系统综合分析以及光纤加工工艺等需要克服的技术难题。最后,从光纤的性能特点、加工难易程度以及研究的理论和实验水平几方面综合比较,高阶模光纤的模式转换法和基于增益控制的反折射率导引方式是实现大模场光纤激光的两种最有效的方法,其模场面积的提升具有较大的空间。
In order to overcome the limitations of the nonlinear effects and optical damage,the high power active fibers usually have large mode areas.The current main technical means used in large mode area fibers were reviewed,which include the fiber structural design,mode control and selection,and mode transfor.Then the basic idea of the various technical means and the primary characteristics of the relevant large mode area fibers were described.On the basis,it was pointed that the difficult problems like mode distortion as well as the high order mode suppression,the integration analysis for laser systems and the fiber fabrications when they were applied in the actual applications.Finally,by comparing the fiber performance characteristic,processing ease,and the study level of the theoretical and experimental aspects,the mode transfor with the higher order mode fiber and the gain guiding,index anti-guiding approach are considered to be the two most effective ways to achieve the large mode area fiber lasers.It is possible to improve the mode areas.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第3期455-462,共8页
Infrared and Laser Engineering
基金
国家973计划资助项目(61359020101)
