Optima Research home page Gibbs'
Phenomenon 		 
Physical optics sample file: the Gibbs phenomenon
 

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This screenshot shows the beam irradiance of a top-hat beam on an aperture, right at the aperture:

intensity right at the aperture

and this screenshot shows the beam irradiance after a short propagation beyond the aperture. The ringing of intensity is known as Gibbs' phenomenon

intensity just after the aperture

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