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VOLUME 19 (1974) | ISSUE 3 | PAGE 176
Diffraction limit of focusing of ultrashort light pulses by a zone plate
An expression is derived for the field of a light pulse of arbitrary initial shape, with Gaussian initial intensity distribution over the cross section, passing through a zone plate. The variation of the time-dependent shape and of the duration of this pulse in the region of the zone plate is investigated. It is indicated on the basis of this investigation that it is possible to estimate the duration of sufficiently short light pulses.