Abstract
Diffraction of focused truncated Gaussian beams at a circular aperture is investigated experimentally. The beams are obtained from a uniformly illuminated Gaussian transmittance filter. The irradiance along the axis is measured point by point in order to demonstrate the existence of the focal shifts. Diffraction patterns in various planes normal to the axis are presented by photographs. Measured results are compared with theoretical predictions. Close agreement between them has been obtained.
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