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High power orbital-angular-momentum (OAM) beam has dominant advantages incapacity increasing and data receiving for free-space optical communicationsystems at long distance. Utilizing coherent combination of beam arraytechnique and helical phase approximation by piston-phase-array, we haveproposed a generation system of high power novel beam carrying OAM, which couldovercome power limitation of common vortex phase modulator and single beam. Wehave experimentally implemented a high power OAM beam by coherent beamcombination (CBC) of a six-element hexagonal fiber amplifier array. We showthat the CBC technique utilized to control the piston phase differences amongthe array beams has a high accuracy with residual phase errors superior to{\lambda}/30. On the premise of CBC, we have obtained novel vortex beamscarrying OAM of +/- 1 by applying an additional piston-phase-array modulationon the corresponding beam array. The experimental results approximatelycoincide with the theoretical analysis. This work could be beneficial to theareas that need high power OAM beams, like ultra-distance free-space opticalcommunications, biomedical treatments, powerful trapping and manipulation underdeep potential well.

High power orbital-angular-momentum beam generation system based on coherent beam array combination technique