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...
| Prif Awduron: | , , |
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| Fformat: | Erthygl |
| Iaith: | English |
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IEEE
2018-01-01
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| Cyfres: | IEEE Photonics Journal |
| Pynciau: | |
| Mynediad Ar-lein: | https://ieeexplore.ieee.org/document/8304626/ |
| Crynodeb: | 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 |