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Vortex array carried by a pseudo-nondiffracting beam.

Zdenek Bouchal¹

¹Department of Optics, Palacký University, 17. listopadu 50, 772 07 Olomouc, Czech Republic. bouchal@optnw.upo.cz

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|September 24, 2004

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This study introduces a novel method for creating arrays of optical vortices in a pseudonondiffracting beam. The research details the propagation, trajectory, and stability of these off-axis optical vortices.

Area of Science:

Optics and Photonics
Laser Physics
Beam Propagation

Background:

Optical vortices are fundamental in various applications, including optical trapping and information processing.
Pseudonondiffracting beams offer extended propagation distances, making them suitable for robust optical systems.
Controlling the generation and behavior of multiple optical vortices is crucial for advanced optical technologies.

Purpose of the Study:

To propose a method for generating an array of optical vortices nested at off-axis positions within a pseudonondiffracting background beam.
To thoroughly analyze the free-space propagation characteristics of a single off-axis vortex.
To investigate the conditions necessary for the stable propagation of these vortex arrays.

Main Methods:

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Theoretical analysis of the free-space propagation of a single off-axis vortex.

Detailed examination of the evolution of the beam intensity profile.

Description of the vortex trajectory and the nucleation of additional vortex pairs.

Discussion of propagation stability conditions.

Main Results:

A method for generating off-axis optical vortices in a pseudonondiffracting beam is proposed.
The propagation dynamics, including intensity profile evolution and vortex trajectory, are thoroughly analyzed.
Conditions for stable propagation of the off-axis vortex and vortex arrays are identified.
An experimental setup for generating both single off-axis vortex beams and arrays is presented.

Conclusions:

The proposed method enables the controlled generation of off-axis optical vortices within pseudonondiffracting beams.
Understanding vortex propagation and stability is key to harnessing their potential in applications.
The presented experimental setup provides a pathway for practical implementation and further research.