轴棱锥透镜面形偏差对无衍射光束传播特性的影响  

Influence of the Surface Deviation Axicon on the Propagation Characteristics of Non-diffracting Beam

作　　者：杨贵洋 马国鹭[1] 曾国英[1] YANG Gui-yang;MA Guo-lu;ZENG Guo-ying(Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology,Mianyang,Sichuan 621010,China)

机构地区：[1]西南科技大学制造过程测试技术省部共建教育部重点实验室,四川绵阳621010

出　　处：《光子学报》2019年第1期75-82,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61505169);西南科技大学研究生创新基金(No.17ycx132)~~

摘　　要：为了探究轴棱锥透镜面形偏差对无衍射光束传播特性的影响,建立了三种相对理想锥镜母线的偏离模型,即母线向内侧凹陷、外侧凸出、顶点呈双曲线分布的轴棱锥透镜.推导了各偏离锥镜的振幅透过率函数,并基于菲涅耳衍射理论对平面波经三种母线偏离锥镜的出射光场及光强分布进行了理论分析与数值模拟.结果表明:锥镜母线内凹时,光场强度变小,焦深延长,纵截面光场逐渐发散,沿轴向传输时中心光斑直径逐渐变大;锥镜母线外凸时,光场强度激增,焦深变短,纵截面光场逐渐汇聚,沿轴向传输时中心光斑直径逐渐变小;锥镜顶点呈双曲线分布时,光场振荡加剧,场强和焦深几乎不变,纵截面光场发散后逐渐恢复至均匀分布状.研究结果可为分析轴棱锥透镜锥面加工误差对无衍射光束传播特性的影响、进一步完善无衍射光束衍射场理论,以及拓宽其工程应用范围等提供参考.In order to investigate the influence of the surface deviation axicon on the propagation characteristics of the non-diffracting beam,three deviation models relative to the ideal,which are concave to the inner side,convex to the outer side and hyperbolic distribution of the apex of the axicon were established.The amplitude transmittance function was deduced,and the emergent light field and intensity distribution of plane wave through the three kinds of axicon lens was analyzed and simulated on the basis of Fresnel diffraction theory.The results show that the intensity of the light field decreases,the focal length is prolonged,the light field of the longitudinal section gradually diverges and the diameter of the center spot is gradually increased along the axis when the generatrix concave to the inner side.The intensity of the light field increases,the focal length becomes shorter,the longitudinal section of the light field gradually converges and the diameter of the center spot along the axial becomes smaller when the generatrix convex to the outer side.When the vertex of axicon is distributed in hyperbola,the light field oscillation intensifies,the field intensity and the focal depth are almost constant and the longitudinal section of the light field gradually diverges and then returns to uniform distribution.The study will provide a theoretical basis for analyzing the influence of the machining error of axicon lens on the propagation characteristics of non-diffracting beam,and has a reference significance for further supplementing the diffraction field theory of non-diffracting beam and broadening the range of its engineering application.

关 键 词：物理光学 无衍射光束 轴锥镜法 衍射理论 贝塞尔光束 加工误差 面形偏差 

分 类 号：O436.1[机械工程—光学工程]