Enforcing Energy Balance in Coherently Superimposed Optical Vortices

Jaime Cisternas; Jaime A. Anguita; Gustavo Funes

doi:10.1109/JPHOT.2018.2810446

Enforcing Energy Balance in Coherently Superimposed Optical Vortices

Jaime Cisternas, Jaime A. Anguita, Gustavo Funes

Research output: Contribution to journal › Article › peer-review

Abstract

The generation of optical beams with multiple, mutually coherent orbital-angular-momentum (OAM) modes using phase gratings is analyzed from the perspective of energy distribution and radial mode composition. We show that phase gratings designed with equally weighted Laguerre-Gauss (LG) modes will generate beams with uneven energy distribution among OAM components. This unwanted outcome cannot be corrected by adjusting the width of the illuminating beam. We propose a way to design phase gratings that will produce a uniform energy distribution among the constituent OAM states after illumination while minimizing the content of high radial modes. This method is based on a generalized definition for the LG modes that take advantage of the freedom to select their radial scales.

Original language	American English
Journal	IEEE Photonics Journal
Volume	10
Issue number	2
DOIs	https://doi.org/10.1109/JPHOT.2018.2810446
State	Published - 1 Apr 2018

Keywords

coherent communications
Diffraction gratings
free-space optical communications
optical vortices

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title = "Enforcing Energy Balance in Coherently Superimposed Optical Vortices",

abstract = "The generation of optical beams with multiple, mutually coherent orbital-angular-momentum (OAM) modes using phase gratings is analyzed from the perspective of energy distribution and radial mode composition. We show that phase gratings designed with equally weighted Laguerre-Gauss (LG) modes will generate beams with uneven energy distribution among OAM components. This unwanted outcome cannot be corrected by adjusting the width of the illuminating beam. We propose a way to design phase gratings that will produce a uniform energy distribution among the constituent OAM states after illumination while minimizing the content of high radial modes. This method is based on a generalized definition for the LG modes that take advantage of the freedom to select their radial scales.",

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