An additive manufacturing system includes at least two high power lasers to generate beams. A phase patterning unit is used to receive and alter phase of a beam from at least one of the two high power lasers. At least one phase patterned beam can be mixed with another beam at a print the print bed. In some embodiments, beams are moved with respect to the print bed by changes in phase patterns from the phase patterning unit. In other embodiments, phase patterns from the phase patterning unit can be used for simultaneous printing of multiple layers.