Propagation of a multi-vortex beam: far-field diffraction of a Gaussian beam from a multi-fork phase grating

被引:4
作者
Rasouli, Saifollah [1 ,2 ]
Gholami, Azam [1 ]
Amiri, Pouria [1 ]
Kotlyar, Victor V. [3 ]
Kovalev, Alexey A. [3 ]
机构
[1] Inst Adv Studies Basic Sci IASBS, Dept Phys, Zanjan 4513766731, Iran
[2] Inst Adv Studies Basic Sci IASBS, Opt Res Ctr, Zanjan 4513766731, Iran
[3] RAS, Branch FSRC Crystallog & Photon, Image Proc Syst Inst RAS, 151 Molodogvardeyskaya St, Samara 443001, Russia
基金
俄罗斯科学基金会; 美国国家科学基金会;
关键词
ORBITAL ANGULAR-MOMENTUM; OPTICAL VORTICES; TOPOLOGICAL CHARGE; BEHAVIOR;
D O I
10.1364/JOSAA.460772
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In this work, the far-field propagation of multi-vortex beams is investigated. We consider diffraction of a Gaussian wave from a spatial light modulator (SLM) in which a multi-fork grating is implemented on it at the waist plane of the Gaussian wave. In the first-order diffraction pattern a multi-vortex beam is produced, and we consider its evolution under propagation when different multi-fork gratings are implemented on the SLM. We consider two different schemes for the phase singularities of the implemented grating. A topological charge (TC) equal to l1 is considered at the center of the grating, and four similar phase singularities all having a TC equal to l2 = l41 (or l2 = ??? l41) are located on the corners of a square where the l1 singularity is located on the square center. Some cases with different values of l1, and consequently l2, are investigated. Experimental and simulation results show that if signs of the TCs at the corners and center of the square are the same, the radius of the central singularity on the first-order diffracted beam increases, and it convolves the other singularities. If their signs are opposite, the total TC value equals zero, and at the far-field, the light beam distribution becomes a Gaussian beam. For determining the TCs of the resulting far-field beams, we interfere experimentally and by simulation the resulting far-field beams with a plane wave and count the forked interference fringes. All the results are consistent. ?? 2022 Optica Publishing Group
引用
收藏
页码:1246 / 1255
页数:10
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