A method for time synchronization of picosecond and sub-picosecond laser pulses by means of a feedback loop based on measurement of the relative delay of the pulses of a signal and pump beam, using their interaction in a nonlinear medium, wherein a partial signal beam and a partial pump beam are uncoupled from a primary signal beam and a primary pump beam immediately before interacting, which is affected by the synchronization; the polarization of the partial signal beam and the polarization of the partial pump beam are adjusted so that the intensity of the vertical and horizontal polarization components of both the partial beams are comparable; the horizontal and vertical pulse polarization components of exactly one of the partial beams (8a or 10a) are mutually time-delayed; subsequently, a combined beam, formed by the mutually delayed pulse polarization components of exactly one of the partial beams (8a or 10a) and both pulse polarization components of the other partial beam (10a or 8a), is directed to at least two mutually orthogonally oriented anisotropic nonlinear media exhibiting the Optical Parametric Amplification that are consecutively arranged in the combined beam path without an optical element between them, whereas amplification of the horizontal (8a-x) and vertical (8a-y) pulse polarization components of the partial signal beam occurs separately in each of the respective appropriately oriented anisotropic nonlinear media exhibiting the Optical Parametric Amplification; and there the intensity of the respective pulse polarization component of the partial signal beam is amplified at the expense of energy from the corresponding pulse polarization component of the partial pump beam and an idler beam is generated, whereas the idler beam together with the amplified signal beam form the modified combined beam; subsequently, the measuring and evaluating element measures and compares the intensities of both pulse polarization components of the amplified partial signal beam and/or the idler beam and based on the acquired data, the feedback loop is implemented. a partial signal beam and a partial pump beam are uncoupled from a primary signal beam and a primary pump beam immediately before interacting, which is affected by the synchronization; the polarization of the partial signal beam and the polarization of the partial pump beam are adjusted so that the intensity of the vertical and horizontal polarization components of both the partial beams are comparable; the horizontal and vertical pulse polarization components of exactly one of the partial beams (8a or 10a) are mutually time-delayed; subsequently, a combined beam, formed by the mutually delayed pulse polarization components of exactly one of the partial beams (8a or 10a) and both pulse polarization components of the other partial beam (10a or 8a), is directed to at least two mutually orthogonally oriented anisotropic nonlinear media exhibiting the Optical Parametric Amplification that are consecutively arranged in the combined beam path without an optical element between them, whereas amplification of the horizontal (8a-x) and vertical (8a-y) pulse polarization components of the partial signal beam occurs separately in each of the respective appropriately oriented anisotropic nonlinear media exhibiting the Optical Parametric Amplification; and there the intensity of the respective pulse polarization component of the partial signal beam is amplified at the expense of energy from the corresponding pulse polarization component of the partial pump beam and an idler beam is generated, whereas the idler beam together with the amplified signal beam form the modified combined beam; subsequently, the measuring and evaluating element measures and compares the intensities of both pulse polarization components of the amplified partial signal beam and/or the idler beam and based on the acquired data, the feedback loop is implemented.