Coherent beam combining of fiber amplifier arrays is a promising way to increase power of fiber lasers, and overcome
the physical limitations to fiber laser power scaling. We performed the coherent combining of fiber amplifier arrays
using active control of the phase of each amplifier. The phase fluctuations in the fiber amplifiers have been measured and
their effect on the beam combining process stability evaluated. We extended the coherent beam combining technique to
perform wavefront shaping, in order to deliver a high brightness beam after turbulent atmospheric propagation. We
present experimental results exhibiting the capability of the modulation multiplexing technique that we implemented to
compensate phase fluctuations due to turbulent atmospheric propagation on the laser beam path. Moreover, and for the
first time to our knowledge, we demonstrate automatic coherent combining of fiber amplifiers on a diffuse surface, after
propagation through turbulent atmosphere, without any external turbulence measurement subsystem.
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