A method for generating phase-locked delayed pulses, comprising: supplying to an input port an input electromagnetic radiation pulse (Pin); said input pulse (Pin) being to be propagated along a propagation direction (z) and having a first linear polarization different from both a first direction (x), which is orthogonal to the propagation direction (z), and a second direction (y), which is orthogonal to the first direction (x) and the propagation direction (z); providing an adjustable Babinet-Soleil module optically coupled to said input port, having a first polarization direction parallel to said first direction (x) and comprising a first adjustable wedge pair comprising a first optical wedge and a second optical wedge both made of a first birefringent material and which both show a first fast polarization direction parallel to the first direction (x) and a first slow polarization direction parallel to the second direction (y), the first adjustable wedge pair being structured to introduce a first total shorter delay in radiation having linear polarization along the first direction (x) and a first total longer delay in the radiation having linear polarization along the second direction (y), and an optical element made of a second birefringent material and having a second fast polarization direction parallel to the second direction (y) and structured to introduce a longer delay in the first direction (x) and a shorter delay in the second direction (y); providing a second adjustable wedge pair optically coupled to the Babinet-Soleil module, made of a third material, structured to have an optical axis parallel to said propagation direction (z) and introducing an equal delay in the electromagnetic radiation pulses propagating along the propagation direction (z), the second adjustable wedge pair being configured to be movable to vary an optical path along the propagation direction (z) so as to keep at a constant value a total length covered by electromagnetic radiation passing through the Babinet-Soleil module and the second wedge pair; generating by means of the adjustable Babinet-Soleil module and from the input pulse (Pin) a first pulse (P 2x) polarized along the first direction (x) and a second pulse (P 2y) collinear to said first pulse (P2x) and polarized along the second direction (y), and introducing by the adjustable Babinet-Soleil module an adjustable group delay ΔT between the first pulse (P2x) and the second pulse (P2y) ranging from a minimum value ΔT m to a maximum value ΔT M; the maximum value ΔT M being a value greater than 10 fs; where the first pulse (P2x) and the second pulse (P2y) are phase-locked delayed replicas of the input pulse (Pin). supplying to an input port an input electromagnetic radiation pulse (Pin); said input pulse (Pin) being to be propagated along a propagation direction (z) and having a first linear polarization different from both a first direction (x), which is orthogonal to the propagation direction (z), and a second direction (y), which is orthogonal to the first direction (x) and the propagation direction (z); providing an adjustable Babinet-Soleil module optically coupled to said input port, having a first polarization direction parallel to said first direction (x) and comprising a first adjustable wedge pair comprising a first optical wedge and a second optical wedge both made of a first birefringent material and which both show a first fast polarization direction parallel to the first direction (x) and a first slow polarization direction parallel to the second direction (y), the first adjustable wedge pair being structured to introduce a first total shorter delay in radiation having linear polarization along the first direction (x) and a first total longer delay in the radiation having linear polarization along the second direction (y), and an optical element made of a second birefringent material and having a second fast polarization direction parallel to the second direction (y) and structured to introduce a longer delay in the first direction (x) and a shorter delay in the second direction (y); providing a second adjustable wedge pair optically coupled to the Babinet-Soleil module, made of a third material, structured to have an optical axis parallel to said propagation direction (z) and introducing an equal delay in the electromagnetic radiation pulses propagating along the propagation direction (z), the second adjustable wedge pair being configured to be movable to vary an optical path along the propagation direction (z) so as to keep at a constant value a total length covered by electromagnetic radiation passing through the Babinet-Soleil module and the second wedge pair; generating by means of the adjustable Babinet-Soleil module and from the input pulse (Pin) a first pulse (P 2x) polarized along the first direction (x) and a second pulse (P 2y) collinear to said first pulse (P2x) and polarized along the second direction (y), and introducing by the adjustable Babinet-Soleil module an adjustable group delay ΔT between the first pulse (P2x) and the second pulse (P2y) ranging from a minimum value ΔT m to a maximum value ΔT M; the maximum value ΔT M being a value greater than 10 fs; where the first pulse (P2x) and the second pulse (P2y) are phase-locked delayed replicas of the input pulse (Pin).