可变光阑对焦深影响的探究  

Exploration of the influence of variable apertureon the depth of focus

作　　者：石琛琛 SHI Chen-chen(College of Physics and Materials Science,Tianjin Normal University,Tianjin 300387,China)

机构地区：[1]天津师范大学物理与材料科学学院,天津300387

出　　处：《激光与红外》2024年第1期116-121,共6页Laser & Infrared

摘　　要：传统的标量光场其偏振态空间均匀分布,而矢量光场相较于标量光场其偏振态是空间变化的。这个空域变化的偏振特性使得矢量光场具有更大的调控自由度,在焦场设计、光学微操纵、微加工、以及量子信息领域有着潜在的应用。本文基于Richards-Wolf矢量衍射理论,研究了可变光阑以及透镜数值孔径对双环角向偏振光束聚焦特性的影响。结果表明,通过改变光阑大小以及透镜数值孔径,不仅可以改变焦斑光强、焦斑大小,也可以显著改变焦场暗通道的长度,从而生成较长的暗通道。生成的可变焦场暗通道未来可用于光学微操纵以及微加工的应用中。Traditional scalar light fields have spatially uniform polarization states,whereas vector light fields have spatially varying polarisation states compared to scalar light fields.The spatial variation of the polarization characteristics enables the vector light field to have greater control freedom with potential applications in the field of focal field design,optical micromanipulation,micromachining,and quantum information.In this paper,based on the Richards-Wolf vector diffraction theory,the effects of variable aperture as well as lens numerical aperture on the focusing characteristics of a double-ring-shaped azimuthally polarized beam are investigated based on the Richards-Wolf vector diffraction theory.The results clearly show that by changing the aperture size and lens numerical aperture,it is possible to change not only the focal spot intensity and the focal spot size,but also the length of the dark channel in the focal field,resulting in longer dark channels.The resulting variable focal field dark channel can be used in the future for optical micromanipulation and microprocessing applications.

关 键 词：Richards-Wolf积分 双环角向偏振光束 焦深 拉盖尔高斯光束 

分 类 号：TN206[电子电信—物理电子学] O436[机械工程—光学工程]