Mode Conversion and Orbital Angular Momentum Transfer Among Multiple Modes by Helical Gratings

  title={Mode Conversion and Orbital Angular Momentum Transfer Among Multiple Modes by Helical Gratings},
  author={Liang Fang and Jian Wang},
  journal={IEEE Journal of Quantum Electronics},
The coupling feature of the helical gratings (HGs) has been studied on flexible conversion between two orbital angular momentum (OAM) modes by both the transverse and longitudinal modulation of the HGs. Apart from one-to-one OAM exchange, the HGs can achieve OAM transfer among multiple modes and provided that both the helix and phase matching conditions are well satisfied for successive coupling. It is contributed from the fold number of modulation fringes of the HGs and the difference… 

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