初级球差对矢量柱状贝塞耳-高斯光束聚焦场的影响  

Effect of Primary Spherical Aberration on Focusing Field of Cylindrical-Vector Bessel-Gaussian Beams

作　　者：刘勇[1] 陈家璧[2] 

机构地区：[1]肇庆学院物理系,广东肇庆526061 [2]上海理工大学光学与电子信息工程学院,上海200093

出　　处：《光学学报》2009年第7期1996-1999,共4页Acta Optica Sinica

基　　金：国家973计划(2005CB724304)资助课题

摘　　要：通过柱坐标下的的分析方法,获得径向偏振和方位角偏振贝塞耳-高斯光束经具有球差的高数值孔径系统聚焦后的三维光场分布函数,根据光场分布函数模拟了不同球差系数下贝塞耳-高斯光束在焦平面和通过焦点的纵向切面上的光场分布。结果表明,在球差系数增加时,方位角偏振贝塞耳-高斯光束在焦平面上的圆环状光斑内半径逐渐变小到趋于恒定,而外环半径先减小后增大;而衍射焦点偏离高斯焦点的距离越来越大,纵向光强不再对衍射焦平面呈对称分布,调整离焦距离无法完全消除球差的影响;径向偏振贝塞耳-高斯光束会聚场的光强随初级球差的变化规律与方位角偏振贝塞耳-高斯光束的一致。By using similar notation in cylindrical coordinates, the three-dimensional distribution function of focused light field was presented when azimutbally and radially polarized Bessel-Gaussian beam propagated through a high numerical-aperture system with primary spherical aberration. Considering behavior of such beams, the transversal field distributions at focal plane and longitudinal field distributions through focal plane had been simulated at different spherical aberration coefficients. The results show that, in the particular case of a highly focused, azimuthally polarized Bessel-Gaussian beam, the inside radius of annular intensity distribution at the focal plane gradually decreases to a constant with an increase of spherical aberration coefficient, but the outside radius increases. The distance between diffraction focus and Gaussian focus increases more and more, transversal intensity do not take on symmetric distribution about the diffraction focus plane, and the spherical aberration cannot perfectly compensated by defocusing, while the change of light intensity of the radially polarized Bessel-Gaussian beam is similar to that of azimuthally polarized one under different primary spherical aberrations.

关 键 词：物理光学 高数值孔径 贝塞耳-高斯光束 初级球差 方位角偏振 径向偏振 

分 类 号：O435[机械工程—光学工程]