Laser signal transmission system - uses multiple transverse modes for optical beam intensity and has converter and collimator system

An optical laser transmission system includes a laser as source of coherent radiation and an optical system for the uniform irradiation of a distant object which guarantees a steep drop of the intensity at the fringe of the beam of the order of 1 mrad. The laser includes a multiplicity of transverse modes; the optical system includes a focussing beam intensity converter (IU) which completes a phase modulation as a function of the locus. This converter is a light guide (L) which converts the radiation, concentrated at the virtual focus (bi) to the focus (bO) of an optical collimator system (KO).