A method for detection of the modification parameters for modification of the optical characteristics of an optical element arranged in the optical path for modulated radiation of a receiver for optical free-space communication, for compensation of phase disturbances caused as a consequence of atmospheric turbulences, wherein, in said method - the radiation is focused, by means of a lens or other optical system, onto the center of a focal surface arranged in the focal plane, - the focal surface radiation pattern is captured by a camera, - individual radiation intensity speckles are identified within the focal surface by means of image processing software, - for each radiation intensity speckle, the position of the point of maximum radiation intensity is obtained, - to the point of maximum intensity of each radiation intensity speckle, a software-based plane wavefront is assigned, namely a tilting angle and a radiation energy are assigned to each plane wavefront on the basis of the position of the point of maximum intensity and of the radiation intensity of the associated speckle maximum thereof, - the plane wavefronts are sorted in accordance to the amount of the maximal intensities of the radiation intensity speckles, starting with the highest maximum intensity, - one of the wavefronts is selected as a reference wavefront, - on the basis of the reference wavefront, phase shifts of the wavefronts relative to each other are obtained, - the optical element is modified in correspondence to different phase shifts assumed per wavefront, wherein, for each plane wavefront, that assumed phase shift at which the energy of the radiation of the respective wavefront is maximal, is selected as the obtained phase shift assigned to this plane wavefront, - from the wavefronts, the energies of the radiation of the these wavefronts, the tilting angles and the detected phase shifts, there is obtained a set of modification parameters for the modification of the optical characteristics of the optical element required for compensation of the phase disturbances. - the radiation is focused, by means of a lens or other optical system, onto the center of a focal surface arranged in the focal plane, - the focal surface radiation pattern is captured by a camera, - individual radiation intensity speckles are identified within the focal surface by means of image processing software, - for each radiation intensity speckle, the position of the point of maximum radiation intensity is obtained, - to the point of maximum intensity of each radiation intensity speckle, a software-based plane wavefront is assigned, namely a tilting angle and a radiation energy are assigned to each plane wavefront on the basis of the position of the point of maximum intensity and of the radiation intensity of the associated speckle maximum thereof, - the plane wavefronts are sorted in accordance to the amount of the maximal intensities of the radiation intensity speckles, starting with the highest maximum intensity, - one of the wavefronts is selected as a reference wavefront, - on the basis of the reference wavefront, phase shifts of the wavefronts relative to each other are obtained, - the optical element is modified in correspondence to different phase shifts assumed per wavefront, wherein, for each plane wavefront, that assumed phase shift at which the energy of the radiation of the respective wavefront is maximal, is selected as the obtained phase shift assigned to this plane wavefront, - from the wavefronts, the energies of the radiation of the these wavefronts, the tilting angles and the detected phase shifts, there is obtained a set of modification parameters for the modification of the optical characteristics of the optical element required for compensation of the phase disturbances. <EOS>