透镜球差对拉盖尔-高斯涡旋光束聚焦特性的影响及改善方法  

Effect of spherical aberration on focusing characteristics of Laguerre-Gaussian vortex beams and its improvement

作　　者：康琦 陈笑[1] 王义全[1] 蔡园园[1] 王朝阳 史冰耀 KANG Qi;CHEN Xiao;WANG Yiquan;CAI Yuanyuan;WANG Zhaoyang;SHI Bingyao(Engineering Research Center of Photonic Design Software,College of Science,Minzu University of China,Beijing 100081,China)

机构地区：[1]中央民族大学理学院光子系统工程软件教育部工程研究中心,北京100081

出　　处：《光电子．激光》2024年第8期874-879,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61975247);国家重点研发计划(2021YFB3601404)资助项目。

摘　　要：涡旋光场调控对涡旋光在激光通信、生物操控等领域的应用研究具有重要意义。为了揭示透镜球差对拉盖尔-高斯(Laguerre-Gaussian, LG)涡旋光束传输特性的影响,本文基于菲涅尔衍射理论,模拟研究了不同透镜球差系数下的LG光束聚焦场的强度、相位以及螺旋谱分布。结果表明:光学系统初级球差系数的增大恶化了LG光束聚焦场的强度分布和螺旋相位,弥散了轨道角动量(orbital angular momentum, OAM)。由此,本文提出了一种光阑补偿方案,通过在透镜前添加大小合适的圆孔光阑,以消除透镜像差。光阑补偿后的LG光束聚焦场由星芒状空心分布恢复为空心圆环分布,OAM态保持单一稳定。本研究工作为改善透镜像差对涡旋光的传输影响提供了解决方案。The modulation of vortex light field is essential for the application of vortex light in laser communication,biological manipulation and other fields.Based on Fresnel diffraction theory,we numerically simulate the intensity,phase and spiral spectrum distribution of Laguerre-Gaussian(LG)beams with various lens spherical aberration coefficients in order to reveal the aberration effect on the propagation of LG vortex beams.The results show that the increase of the primary spherical aberration coefficient of the optical system deteriorates the LG intensity distribution and spiral phase,and disperses the orbital angular momentum.Therefore,the aperture compensation scheme is proposed,in which the lens aberration is eliminated by placing an appropriate-size circular aperture in front of a lens.After the aperture compensation,the focus field of the LG beam is restored from the star-shaped hollow distribution to the hollow ring distribution,and the orbital angular momentum state remains single and stable.This work provides a method for improving the lens aberration on vortex light transmission.

关 键 词：涡旋光 球差透镜 轨道角动量(OAM) 螺旋谱 圆孔光阑 

分 类 号：O436[机械工程—光学工程]