Bessel光束经椭圆环形孔径后的衍射光场  

Diffraction optical field of the Bessel beam through elliptical annular aperture

作　　者：谢晓霞[1] 王硕琛 吴逢铁[1] 

机构地区：[1]华侨大学信息科学与工程学院,福建省光传输与变换重点实验室,厦门361021

出　　处：《物理学报》2015年第12期166-170,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61178015);福建省科技创新平台计划(批准号:2012H2002);泉州市科技重点项目(批准号:2014Z127)资助的课题~~

摘　　要：基于菲涅耳衍射积分理论及硬边孔径的复高斯函数展开法导出了Bessel光束经椭圆环形孔径后的光场表达式,数值模拟了其光场的强度分布.研究了Bessel光束经椭圆环形孔径后的光场变化及其传播过程;在实验上利用轴棱锥输出的近似无衍射Bessel光,通过椭圆环形孔径,使用电荷耦合器件拍摄得到不同传播距离处的光强分布.理论结果和实验结果均表明无衍射光束经椭圆环形孔径后会产生空心光束.Based on Fresnel diffraction theory and complex ~ausslan mnctlon expansion oI naraoe^ect aperture, ~ up^L~,~l field formula of Bessel beam propagating through an elliptical annular aperture is derived, and the transverse intensity distribution of the beam is numerically simulated. The changes of the optical field and the propagation process of the diffracted beam behind the elliptical annular aperture are studied. In the experiment for the first time, a quasi non- diffracting beam is generated by an axicon and the patterns that are due to the beam diffraction by an elliptical annular aperture at different propagation distances are observed with a charge-coupled device camera. The theoretical analysis and experiuxentat results both show that Bessel beam passing through an elliptical annular aperture can generate a hollow beam.

关 键 词：BESSEL光束 椭圆环形孔径 空心光束 衍射理论 

分 类 号：O436.1[机械工程—光学工程]