Gaussian-beam theory of lenses with annular aperture

@article{Sheppard1978GaussianbeamTO,
  title={Gaussian-beam theory of lenses with annular aperture},
  author={C. Sheppard and T. Wilson},
  journal={Iee Journal on Microwaves, Optics and Acoustics},
  year={1978},
  volume={2},
  pages={105-112}
}
The light distribution produced by a lens with an annular aperture with approximately Gaussian cross-section is calculated by summing over Laguerre-Gaussian modes. The advantage of this approach is that it gives the intensity at all points in space. This is of particular value when the cross-section of the annulus is narrow compared with its radius, because then the intensity varies slowly along the optic axis. Intensity is plotted for the region near the focus, far from the focus, along the… Expand
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