Abstract
An analytical expression for the time evolution of the diffraction pattern of an ultrashort laser pulse passing through a circular aperture is obtained in the Fresnel regime. The diffraction is not constant in time as the pulse travels through the aperture. This may have implications in experiments involving fast dynamics. Examples of the evolution of the diffraction pattern are given.
Highlights
In this paper, we analyze the evolution in time of the diffraction pattern of an ultrashort pulse through a circular aperture in the Fresnel regime
The usual theory for short pulses which assumes that the propagation of all spectral components of the pulse can be considered in a manner that is independent of the wavelength is valid only for pulses of many cycles
Diffraction studies of the integrated intensity of the whole pulse have been done, there is, as far as we know, no detailed study on the evolution in time of the diffraction pattern. This is mainly due to the fact that, because of the high frequency oscillation of the light field, no detector in the optical regime is available that can resolve the temporal evolution of the diffracted pattern
Summary
We analyze the evolution in time of the diffraction pattern of an ultrashort pulse through a circular aperture in the Fresnel regime. F. Pereira* Optics Research Group, Department of Imaging, Science and Technology Faculty of Applied Sciences, Delft University of Technology Lorentzweg 1, 2628 CJ Delft, The Netherlands *E-mail: s.f.pereira@tnw.tudelft.nl
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