Abstract: A high-power laser system for thermally treating a surface is configured with one or more laser sources generating respective source beams with respective arbitrary powers and at respective wavelengths. The source beams are delivered to a laser head via respective fiber trains which have respective output ends terminated within the laser head. Mounted in the laser head is an optical mixer having its input face opposing the output ends of respective fiber trains which form together the predetermined spatial arrangement. The optical mixer is configured to receive the source output beams from respective output fiber ends so as to combine and shape the coupled output beams into at least one system output beam forming a beam spot with the desired PDD and desired shape.

Abstract: The disclosed ultra-high power all fiber laser system is configured with multiple spaced apart fiber lasers outputting respective laser beams respective paths. The disclosed system is further configured with a tapered fiber-bundle including at least one central guiding fiber and a plurality of peripheral guiding fibers. The disclosed system further has a multicore delivery fiber provided with at least two concentric and radially spaced apart central and peripheral cores. The peripheral core is coupled to the peripheral guiding fibers while the central core is spliced to the central guiding fiber so that a system outputs beams emitted from respective central and peripheral core of the delivery fiber having a different beam shape from the system output emitted from the outer core.