微小孔非傍轴衍射光束传输特性的研究  

Propagation Characteristics of Nonparaxial Scalar Beams Diffracted by a Small Aperture

作　　者：牛国鉴[1] 邓小玖[1] 刘彩霞[1] 李国祥[1] 

机构地区：[1]合肥工业大学物理系,合肥230009

出　　处：《光子学报》2010年第10期1840-1843,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(50776084);火灾科学国家重点实验室开放课题(HZ2009-KF08)资助

摘　　要：基于非傍轴标量光束横截面上光强的精确定义,对桶中功率和二阶矩定义的光束束宽、远场发散角和M2因子等进行了比较研究.以平面波的微小圆孔衍射光束为例,进行了详细的数值计算.结果表明,桶中功率定义的光束束宽、远场发散角和M2因子较二阶矩定义的小,两种定义的M2因子都随束腰趋于零而趋向于零,桶中功率定义的光束束宽的传播规律与双曲线存在一定偏差.Based on the accurate definition of light intensity of nonparaxial scalar beams at the transverse plane,a comparative study of the beam widths,far-field divergence angles and M2 factors defined by the power in the bucket and second-order moment is made.Taking the nonparaxial diffraction of a small circular aperture as an example,the detailed numerical calculation is performed.The results show that the beam width,far-field divergence angle and M2 factor defined by the power in the bucket are less than that defined by the second-order moment.Both M2 factors tend to zero as beam waist vanishes,the propagation of beam width defined by the power in the bucket is different from the hyperbolic law.

关 键 词：非傍轴标量光束 二阶矩 桶中功率 传输特性 

分 类 号：O463.1[机械工程—光学工程]