Resumen
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.
Idioma original | Inglés |
---|---|
Número de artículo | 7901712 |
Publicación | IEEE Photonics Journal |
Volumen | 10 |
N.º | 2 |
DOI | |
Estado | Publicada - abr. 2018 |
Nota bibliográfica
Publisher Copyright:© 2009-2012 IEEE.
Palabras clave
- coherent communications
- Diffraction gratings
- free-space optical communications
- Optical vortices