摘要
设计了一种周期型正交二元相位板,其具有周期型矩形调制单元,各单元的相位调制量为0或π。该相位板的空间频谱具有中心直流分量为0的特点,分别对该频谱中心区域的4个一级频谱点和8个二级频谱点进行相位调制,可得到正方阵列光斑和正方阵列涡旋。阵列涡旋中各涡旋光束的拓扑荷数l=±1,在空间交错分布。由于两个正方阵列光场在垂直传播方向的横向周期恰好重合,且两个光场沿光轴方向的波数不同,因此叠加之后可以形成强度分布随传输距离旋转的正方阵列螺旋,阵列中存在两种具有相反螺旋方向的螺旋光束,同样在空间呈交错分布。此外,讨论了产生最佳螺旋光束的相位板设计条件,并给出理想情况下系统的能量利用率,所得实验结果验证了该方法的可行性。
Objective Due to its peculiar phase and intensity distribution,the vortex beam has attracted extensive attention in particle manipulation and communication.Interference of a vortex beam with a plane wave can generate a helix beam with peculiar helical intensity distribution,providing a potential research platform for studying nonlinear topological edge solitons and anomalous topological phases.Multiple vortex and helix beams arrange in a specific distribution to form the field of the optical vortex array(OVA)and optical helix array(OHA).The array has multiple phase singularities compared to a single beam,which has essential applications in multiparticle manipulation and multichannel communication.The wideranging applications of array fields rely on generating highquality optical fields.Currently,various methods have been proposed to generate OVA and OHA,such as using fractional Tabor effect,grating diffraction,or direct adoption of vortex lasers.In these methods,by employing the fractional Talbot effect,the field with the best contrast can only be obtained at a specific distance.The intensity distribution of the OVA generated by grating diffraction is not uniform,and the vortex laser suffers from low energy efficiency.Compared to the abovementioned methods,the field generated by the multibeam interference features propagation invariance and high efficiency and becomes one way to generate the OVA and OHA.Therefore,the adoption of multibeam interference to generate OVA and OHA is of potential research significance.Methods Based on the principle of multibeam interference,a periodic orthogonal binary phase plate is designed for generating square optical vortex array(SOVA)and square optical helix array(SOHA)fields.After filtering the spectrum of the phase plate,four symmetric spots in the central region of the spectrum and eight symmetric spots in the subcentral region of the spectrum are modulated separately.Then,the corresponding beams of these spots are obtained by the Fourier transform,and they interfere with each
作者
李金龙
宋洪胜
张玉芹
贺长伟
李大伟
刘轩
Li Jinlong;Song Hongsheng;Zhang Yuqin;He Changwei;Li Dawei;Liu Xuan(School of Science,Shandong Jianzhu University,Jinan 250101,Shandong,China;Key Laboratory of Materials for High Power Laser,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第14期267-275,共9页
Acta Optica Sinica
基金
山东省高校科研计划项目(J18KA223)
山东建筑大学博士科研基金(XNBS1714)。
关键词
物理光学
阵列涡旋
阵列螺旋
多光束干涉
二元相位板
相位调制
physical optics
optical vortex array
optical helix array
multibeam interference
binary phase plate
phase modulation
