Abstract

We demonstrate the active wavefront control of a 19-core ytterbium-doped fiber amplifier by the digital holography technique. The output wavefront is corrected even in the presence of large externally induced perturbations, with a measured output Strehl ratio of 0.6 in all cases. The wavefront-controlled multicore fiber is used to amplify 800ps pulses at 1064nm at a repetition rate of 40kHz, and a gain of 23dB is obtained.

© 2010 Optical Society of America

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