Device for reducing time distortion generated in light pulses by a nonlinear optical frequency converter system

A device for reducing the temporal distortions induced in light pulses by an optical frequency converter system, said system comprising at least one nonlinear optical component (4) having a nonlinear optical susceptibility χ of the order of 2 or 3, said converter system being capable of receiving at least one incident pulsed light beam (2), the incident light pulses having a duration Δt0, an optical frequency ω0±Δω0 and an intensity I0(t), and of generating, by frequency conversion, at least one output pulsed beam (3), the output light pulses having a duration Δt1, an optical frequency ω1±Δω1 different from ω0±Δω0, and an intensity I1(t) that is a function of I0(t)β, β being a coefficient of saturation of the frequency converter,

• characterized in that said device comprises:
• a linear temporal filter (5) for amplitude pre-compensation arranged in the path of the incident beam (2) and capable of introducing an amplitude pre-compensation as a function of the optical frequency f of the form:
• H
• ccomp
• ⁡
• (
• f
• )
• =
• 1
• +
• γ
• comp
• 2
• 6
• ⁢
• f
• 2
• where γcomp=(ω1/ω0)·γ/√β, γ being the spectral acceptance of the frequency converter for an intensity Icomp, so as to reduce, at at least one compensation intensity Icomp, the intensity temporal distortions induced in said frequency-converted output light pulses.