Enforcing Energy Balance in Coherently Superimposed Optical Vortices
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 ge...
| Autors principals: | , , |
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| Format: | Article |
| Idioma: | English |
| Publicat: |
IEEE
2018-01-01
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| Col·lecció: | IEEE Photonics Journal |
| Matèries: | |
| Accés en línia: | https://ieeexplore.ieee.org/document/8304626/ |
| Sumari: | 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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| ISSN: | 1943-0655 |