Optical vortex generation with a "fork" hologram under conditions of high-angle diffraction

被引：45

作者：

Bekshaev, A. ^{[1
]}

Orlinska, O. ^{[1
]}

Vasnetsov, M. ^{[2
]}

机构：

[1] II Mechnikov Natl Univ, Dvorianska 2, UA-65082 Odessa, Ukraine

[2] Natl Acad Sci Ukraine, Inst Phys, UA-03028 Kiev, Ukraine

来源：

OPTICS COMMUNICATIONS | 2010年 / 283卷 / 10期

关键词：

Optical vortex; Generation; Computer-synthesized hologram; High-angle diffraction; Spatial structure; Beam evolution; ORBITAL ANGULAR-MOMENTUM; WIGNER DISTRIBUTION FUNCTION; GAUSSIAN-BEAM; VORTICES; WAVE; TRANSFORMATION; DISLOCATIONS; MORPHOLOGY; PLANE;

D O I：

10.1016/j.optcom.2010.01.012

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Spatial characteristics of the optical-vortex (OV) beams created during the Gaussian beam diffraction by a grating with groove bifurcation are analyzed theoretically and numerically. In contrast to previous works, condition of small-angle diffraction is no longer required and the diffracted beam can be strongly deformed. This causes the intensity profile rotation and the high-order OV decomposition into a set of secondary single-charged OVs. These effects are studied quantitatively and confronted with similar properties of a Laguerre-Gaussian beam that undergoes astigmatic telescopic transformation. In contrast to the latter case, the secondary OVs do not lie on a single straight line within the beam cross section, and morphology parameters of the individual secondary OVs carried by the same beam are, in general, different. Conditions for maximum relative separation of the secondary OVs with respect to the beam transverse size are specified. The results can be used for practical generation of OV beams and OV arrays with prescribed properties. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：2006 / 2016

页数：11

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