The present invention relates to a system (1) for generating a reduced-duration laser pulse comprising: means for generating (3) an input laser beam providing a femtosecond laser pulse (4) of A wave, propagating along an axis z, spatially uniform in amplitude; • a transparent plate (5) positioned secant to the z axis of propagation of the pulse, the laser pulse having a pfd density such that it induces a self-phase modulation during the crossing of the pulse in the transparent slide so as to generate an extended spectrum laser pulse; Compression means (7) arranged for compressing the extended-spectrum laser pulse so as to generate a reduced-duration laser pulse. The system is such that the generating means (3) of the input laser beam are adapted so that the pulse has an energy greater than 1 Joule, and the transparent blade (5) is formed of a transparent flexible film.
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