量子电子学报, 2009, 26 (2): 134, 网络出版: 2010-05-24
非傍轴标量衍射光束的能量传输特性
Energy transmission characteristics of nonparaxial scalar diffraction beam
物理光学 非傍轴光束 能量传输 圆孔衍射 能量集中度 physical optics nonparaxial beam energy transmission circle aperture diffraction energy concentration degree
摘要
在光束能量传输的分析中,对能量集中度的研究具有十分重要的意义, 能量集中度是评价光束质量的手段之一。采用光强的精确定义给出了经圆孔衍射的非傍轴标量光束能量集中度η 的精确积分表示。对平面波圆孔衍射的能量集中度η随着衍射孔径ρο 和传播距离Z的变化进行了详细的数值计算,结果表明, η随着Z的增加只是在特定条件下才单调减小, η随着ρο的增加不是单调变化, ρο 取某个特定的孔径值时η取得极大值。根据该结果给出了通过控制参数ρο和Z的取值获得光斑最大能量或最大能量集中度的方法。
Abstract
Energy concentration degree which can evaluate the beam quality is significant while analyzing the energy transmission of the beam. The accurate integral expression of energy concentration degree η of nonparaxial scalar beam diffracted by circle aperture is deduced by accurate definition of light intensity. Detailed numerical calculations are carried out to discuss the law of η versus diffraction aperture ρο and transmission distance z. It’s shown that η increases monotonously with the increase of z only under some conditions. η does not increase monotonously with the increase of ρο and it gets the extremum if ρο is taken as a special value. The approach to get the largest energy and energy concentration degree of a spot is given by controlling the parameters ρο and z.
王东, 邓小玖, 刘果红, 李义宝. 非傍轴标量衍射光束的能量传输特性[J]. 量子电子学报, 2009, 26(2): 134. WANG Dong, DENG Xiao-jiu, LIU Guo-hong, LI Yi-bao. Energy transmission characteristics of nonparaxial scalar diffraction beam[J]. Chinese Journal of Quantum Electronics, 2009, 26(2): 134.