A multi beam laser system comprising - a front cavity mirror and a back cavity mirror forming a laser cavity there between, wherein the front cavity mirror comprises a monolithic semi-transparent mirror surface configured as a single out-coupler for coupling a plurality of parallel laser beams out of the laser cavity; - a laser crystal disposed in the laser cavity and formed by a monolithic piece of gain medium configured to amplify laser light for the plurality of parallel laser beams in the laser cavity; and - a lens array disposed in the laser cavity and comprising an integral piece formed by a plurality of interconnected lenses extending side by side in a direction (X,Y) perpendicular to a length of the laser cavity, wherein each lens of the lens array is configured to form a respective closed optical path (OPa) along the length of the laser cavity between the cavity mirrors (11,12) through the laser crystal corresponding to a cavity mode for generating one (LBa) of the plurality of parallel laser beams; - a plurality of light sources configured to generate pump light for pumping the laser crystal; - a light guiding structure configured to guide the pump light from a respective one of the light sources to a respective pump region in the laser crystal, wherein each pump region is disposed on a closed optical path (OPa) in the laser cavity corresponding to a cavity mode of a respective one (LBa) of the parallel laser beams; and - a controller and electronic drivers configured to independently vary the power to each of the light sources for individually controlling each of the plurality of parallel laser beams. - a front cavity mirror and a back cavity mirror forming a laser cavity there between, wherein the front cavity mirror comprises a monolithic semi-transparent mirror surface configured as a single out-coupler for coupling a plurality of parallel laser beams out of the laser cavity; - a laser crystal disposed in the laser cavity and formed by a monolithic piece of gain medium configured to amplify laser light for the plurality of parallel laser beams in the laser cavity; and - a lens array disposed in the laser cavity and comprising an integral piece formed by a plurality of interconnected lenses extending side by side in a direction (X,Y) perpendicular to a length of the laser cavity, wherein each lens of the lens array is configured to form a respective closed optical path (OPa) along the length of the laser cavity between the cavity mirrors (11,12) through the laser crystal corresponding to a cavity mode for generating one (LBa) of the plurality of parallel laser beams; - a plurality of light sources configured to generate pump light for pumping the laser crystal; - a light guiding structure configured to guide the pump light from a respective one of the light sources to a respective pump region in the laser crystal, wherein each pump region is disposed on a closed optical path (OPa) in the laser cavity corresponding to a cavity mode of a respective one (LBa) of the parallel laser beams; and - a controller and electronic drivers configured to independently vary the power to each of the light sources for individually controlling each of the plurality of parallel laser beams.