摘要
根据折射率阶跃对称分布的光纤LP01模端面衍射远场的振幅分布,分析了衍射光束的半值全角宽度及振幅下降到1/e处对应的远场发散角全角各自随光纤归一化频率变化的关系;采用等效匹配效率法分析了远场发散角角半径,拟合出远场发散角角半径随归一化频率变化的函数表达式,并通过误差分析证明了拟合函数表达式的精确性.
Based on the far-field diffraction amplitude distribution of fiber LP01 mode,the relationships between full angle at half maximum and the far-field divergence full angle of the amplitude drop to 1/e point with fiber normalized frequency are analyzed.The equivalent matching efficiency method is employed for the calculation of far-field divergence angle,and the function expression of the angle along with the fiber normalized frequency is fitted,and its accuracy is proved through error analysis.
出处
《五邑大学学报（自然科学版）》
CAS
2010年第2期24-28,共5页
Journal of Wuyi University(Natural Science Edition)
基金
福建省科技厅F5类项目(2007F5040)
福建省自然科学基金资助项目(A0540001)
关键词
远场发散角
半值全角宽度
等效匹配效率法
相对误差
far field divergence angle
full angle at half maximum
equivalent matching efficiency method
relative error
