Near-field diffraction of chirped gratings.

@article{SanchezBrea2016NearfieldDO,
  title={Near-field diffraction of chirped gratings.},
  author={Luis Miguel Sanchez-Brea and Francisco Jose Torcal-Milla and Tom{\'a}s Morlanes},
  journal={Optics letters},
  year={2016},
  volume={41 17},
  pages={
          4091-4
        }
}
In this Letter, we analyze the near-field diffraction pattern produced by chirped gratings. An intuitive analytical interpretation of the generated diffraction orders is proposed. Several interesting properties of the near-field diffraction pattern can be determined, such as the period of the fringes and its visibility. Diffraction orders present different widths and also, some of them present focusing properties. The width, location, and depth of focus of the converging diffraction orders are… 
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