Bessel-like beams with z-dependent cone angles.

@article{Belyi2010BessellikeBW,
  title={Bessel-like beams with z-dependent cone angles.},
  author={Vladimir N. Belyi and Andrew Forbes and Nikolai Kazak and Nikolai A. Khilo and P Ropot},
  journal={Optics express},
  year={2010},
  volume={18 3},
  pages={1966-73}
}
The conventional means of generating Bessel-Gauss beams by axicons in the laboratory results in the distinct disadvantage of an abrupt change in intensity at the boundary of the non-diffracting region. We outline theoretically and then demonstrate experimentally a concept for the creation of Bessel-like beams that have a z-dependent cone angle, thereby allowing for a far greater quasi non-diffracting propagation region. 

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