Fractional orbital angular momentum of a Gaussian beam with an embedded off-axis optical vortex

被引：8
作者：
Kotlyar V.V. [1 ,2 ]
Kovalev A.A. [1 ,2 ]
Porfirev A.P. [1 ,2 ]
Abramochkin E.G. [3 ]
机构：
[1] Image Processing Systems Institute оf RAS, Branch of the FSRC “Crystallography and Photonics” RAS, Samara
[2] Samara National Research University, Samara
[3] Samara Branch of P.N. Lebedev Physical Institute of Russian Academy of Sciences, Samara
来源：
| 1600年 / Institution of Russian Academy of Sciences卷 / 41期
关键词：
Fractional orbital angular momentum; Gaussian beam; Optical vortex; Spiral phase plate;
D O I：
10.18287/2412-6179-2017-41-1-22-29
中图分类号：
学科分类号：
摘要：
We theoretically and experimentally study asymmetric Gaussian optical vortices generated via diffracting a Gaussian beam by an off-axis spiral phase plate or amplitude "fork" hologram. It is shown that depending on the magnitude of the off-axis shift the laser beam can acquire a crescent-shaped cross-section, which rotates on propagation. We obtain an analytical expression for the orbital angular momentum (OAM) of such a beam, which appears to be fractional. We show that with increasing off-axis shift, the OAM decreases parabolically. The experimental results are in qualitative agreement with theory and numerical simulation. © 2017, Institution of Russian Academy of Sciences. All rights reserved.
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页码：22 / 29
页数：7
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