Spot size and radial intensity distribution of focused Gaussian beams in spherical and non-spherical aberration lenses |
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Authors: | Abdu A Alkelly |
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Institution: | Faculty of Science, Department of Physics, Sana’a University, Sana’a, Yemen |
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Abstract: | We discussed the radial intensity distribution in the presence of spherical aberrations (SA) for cases in which the incident field is a focused Gaussian spot. A numerical solution of a two dimensional integral diffraction (paraxial ray) equation for a relatively large SA is developed by using the well-known trapezoidal rule for integration. The mesh size was chosen so that convergence of the integration is insured to one part in 10−8 at successive steps. The spot size and the radial intensity distribution in both SA free lens and lens exhibiting SA are calculated. A relation that determines the spot size at the geometrical focus in aberrated case is developed. |
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