Abstract: The device comprises a laser-type coherent light radiation source transmitting ultrashort pulses, a dynamic beam shaping arrangement and an arrangement for using and processing a laser beam. The dynamic beam shaping arrangement comprises an optical system including a part for actively modifying the laser beam wavefront and a detecting part, excepting a phase meter, used for three-dimensionally shaping the beam. These parts are connected by a feed-back circuit and the active modifying part comprises a first fixed or active component and a second active component.