摘要
分析了基模高斯激光束到单模和多模光纤的单透镜耦合过程中的各种损耗,把多模光纤的光场用高斯分布近似,采用模场耦合理论计算了基模高斯光束到单模和多模光纤的单透镜耦合效率。模拟计算了当激光-光纤耦合系统的工程参数(光束束宽、光纤数值孔径和光纤的纤芯芯径)一定时,单透镜耦合效率与所选用透镜的焦距之间的关系。并利用532nm激光(M2≤1.05)在几种不同焦距的透镜下对纤芯直径为3.5μm的单模光纤和25μm的多模光纤进行了耦合效率的测定实验,得到了与理论计算基本吻合的实验结果。
The model field coupling theory was applied to calculate the coupling efficiency of a Gaussian laser beam to an optical fiber via a single lens. The dependences of the coupling efficiency on the focal length of the lens were investigated for both single-mode and multi-mode fibers. An experiment was conducted to couple a 532 nm laser beam with a M2 factor of 1.05 to both a single-mode fiber with 3.5 μm-core and a multi-mode fiber with 25 μm-core. Good agreement is obtained between the experimental results and the theoretical calculation.
出处
《光电工程》
CAS
CSCD
北大核心
2008年第8期29-34,共6页
Opto-Electronic Engineering
基金
国家自然科学基金资助项目(606760587)
关键词
单透镜耦合
耦合效率
光纤数值孔径
single-lens coupling
coupling efficiency
numerical aperture of fiber
Gaussian beam
