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In this Letter, we demonstrate coherent beam combining of laser pulses, amplified in four separate Yb-doped fiber amplifiers, by using the second-order nonlinear crystal as a combining element. Active phase control was used, and pulses with 240 ps duration were combined in a noncollinear sum-frequency generation configuration. Conversion/combining efficiency up to 49% was achieved. The maximum pulse energy of 108 μJ and average power of 97 W were achieved in the combined beam at 519 nm.
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