Spiral laser beams in inhomogeneous media.

@article{Mahalov2013SpiralLB,
  title={Spiral laser beams in inhomogeneous media.},
  author={Alex Mahalov and E. Suazo and Sergei K. Suslov},
  journal={Optics letters},
  year={2013},
  volume={38 15},
  pages={2763-6}
}
Explicit solutions of the inhomogeneous paraxial wave equation in a linear and quadratic approximation are applied to wave fields with invariant features, such as oscillating laser beams in a parabolic waveguide and spiral light beams in varying media. A similar effect of superfocusing of particle beams in a thin monocrystal film, harmonic oscillations of cold trapped atoms, and motion in magnetic field are also mentioned. 

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