部分相干圆偏振涡旋光束的深聚焦  

Tight Focusing of Partially Coherent and Circularly Polarized Vortex Beams

作　　者：陈宝算[1] 蒲继雄[1] 

机构地区：[1]华侨大学信息科学与工程学院,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2011年第3期269-275,共7页Journal of Huaqiao University(Natural Science)

基　　金：福建省科技计划重点项目(2007H0027);福建省自然科学基金资助项目(A0810012)

摘　　要：基于德拜理论,研究部分相干圆偏振涡旋光束的深聚焦特性,比较左旋和右旋部分相干圆偏振涡旋光束的不同深聚焦特性,并给出相应的物理解释.分析入射光束相干性和聚焦透镜数值孔径大小对深聚焦特性的影响.研究表明,入射光束的相干度和聚焦透镜的数值孔径大小,都会影响深聚焦焦平面的光强和相干度.通过控制各相关参数的取值,可以在聚焦场中获得有广泛实际应用的平顶光束.Based on vectorial Debye theory,the tight focusing properties of partially coherent and circularly polarized vortex beams are investigated.The focused characteristics of right-circular and left-circular polarized partially coherent vortex beams in the focal region are compared by some numerical calculations and some brief physical explanations are presented.Furthermore,the influences of the coherence of the incident beam and the numerical-aperture of the focusing objective on tight focusing properties are studied in great detail.It is shown that the intensity distribution and the spectral degree of coherence near the focus are all influenced by the coherence of the incident beam and the numerical-aperture of the focusing objective.By adjusting certain parameters,the flat-topped beams that have many significant applications are obtained on the focal plane.

关 键 词：深聚焦 德拜理论 涡旋光束 角动量 部分相干 

分 类 号：O436[机械工程—光学工程]