摘要
将部分相干径向偏振涡旋光束的轨道角动量应用于焦场目标探测,根据部分相干及Richards-Wolf矢量衍射积分理论,推导了光束焦场目标平面处的光场分布,讨论了焦平面处的轨道角动量密度分布特性,分析了入射光束的相干长度和聚焦透镜的数值孔径对纵向分量轨道角动量密度分布和轨道角动量的影响。结果表明,随着相干长度的增大,轨道角动量和轨道角动量密度迅速变大,当增大至0.5 cm后,轨道角动量和轨道角动量密度的变化趋于平缓,此后,相干长度的变化不再影响轨道角动量和轨道角动量密度分布。随着数值孔径的增大,轨道角动量和轨道角动量密度始终表现出增长的变化趋势,并且,变化程度在数值孔径大于0.7后越来越大。
The orbital angular momentum of the partially coherent radially polarized vortex beam is applied to the focal field target detection.Based on the partially coherent and the Richards-Wolf vector integral theory,the optical field distributions in the focal field target plane of the beam are derived.The distribution characteristics of the orbital angular momentum density in the focal plane are discussed.The influence of the coherence length of incident beam and the numerical aperture of focusing lens on the orbital angular momentum density distribution and the orbital angular momentum of the longitudinal component is analyzed.The results show that with the increase of the coherence length,the orbital angular momentum and the orbital angular momentum density rapidly increase.When it increases to 0.5cm,the changes of the orbital angular momentum and the orbital angular momentum density tend to be flat.Thereafter,the change of the coherence length no longer affects the orbital angular momentum and the orbital angular momentum density distribution.As the numerical aperture increases,the orbital angular momentum and the orbital angular momentum density always show a growing trend,and the change extent becomes larger after the numerical aperture is greater than 0.7.
作者
贺蕊
吕宏
闫丽凝
庞令阳
HE Rui;Lü Hong;YAN Li-ning;PANG Ling-yang(School of Optoelectronic Engineering,Xi′an Technological University,Xi′an 710021,China)
出处
《激光与红外》
CAS
CSCD
北大核心
2022年第5期678-685,共8页
Laser & Infrared
基金
陕西省自然科学基础研究计划项目(No.2019JM-470)
陕西省教育厅科研计划项目(No.18JS048)资助。
关键词
径向偏振涡旋光束
部分相干
轨道角动量
焦场平面
radially polarized vortex beam
partially coherent
orbital angular momentum
focal plane
作者简介
贺蕊(1997-),女,硕士研究生,主要从事光场传输与测控技术的研究。E-mail:2279443946@qq.com;通讯作者:吕宏(1975-),男,博士,副教授,主要从事激光大气传输与测控技术方向的研究。E-mail:lvhong@xatu.edu.cn。
