摘要
通过比较面光源与多极子点源两种辐射场 ,定义了光斑的形状因子 ,它决定于光斑上的源强分布 .给出了形状因子的确定方法 ,求出了几种常见光斑的形状因子 .把形状因子应用于光纤理论 ,补充了入射端面上的定解条件 ,完整地设定了定解问题 .
By comparing the radiation field excited by a multipole point source with that excited by a cylindrical planar light source,the form factor of the planar light source is defined.The form factor is determined by the distribution of the source strength on the plane.A general formula for form factor is obtained,and several examples of form factor are given.Introduction of form factor in fiber optics completes the formulation of the boundary value problem.The influences of the distribution of the source strength to the modes propagating in a fiber are discussed briefly by using the form factor.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第9期1907-1912,共6页
Acta Physica Sinica
