摘要
仿照罗兰圆光学系统构造罗兰球光学系统 ,在罗兰球中简化电磁波的瑞利 索末菲标量衍射积分公式 ,推导出折射率阶跃分布的弱导光纤LP模衍射场分布和空间频谱的计算公式。提出LP0 1模远场衍射分布存在类似于平面波圆孔夫琅禾费衍射艾里斑的中央亮斑概念 ,并给出中央亮斑角半宽度的计算公式。
Imitated the optical system of Rowland circle structure, the Rowland sphere structure is built in this paper, and the Rayleigh-Sommerfeld diffraction scalar integral formula of electromagnetic wave is simplified on the Rowland sphere structure, and the computational formulas of spatial frequency spectrum and diffractional far field distribution from the weakly guiding optical fiber LP mode are derived. The concept of central disc in LP01 mode optical fiber diffractional far field, which has analogy to the Airy disc of plane wave Fraunhofer diffraction from circular aperture, is presented, and the calculational formulas of LP01 mode optical fiber diffractional far field divergence half width is deduced in the end of this paper.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2003年第9期809-813,共5页
Chinese Journal of Lasers
基金
浙江省自然科学基金 (编号 :6 0 1133)资助项目
关键词
导波光学
弱导光纤
瑞利-索末菲衍射
空间频谱
中央亮斑
Bessel functions
Diffraction
Electric fields
Optical waveguides
Single mode fibers
Spectrum analysis
