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We propose and demonstrate a method for the adaptive wavefront correction ofdynamic multimode fiber beams for the first time. The wavefront of incidentbeam is reconstructed in real-time based on the complete modal information,which obtained by using the modal decomposition of correlation filter method.For the proof of principle, both of the modal decomposition and the wavefrontcorrection are implemented using the same computer-generated hologram, whichencoded into a phase-only spatial light modulator. We demonstrate the wavefrontcorrection of dynamic multimode beam at a rate of 5Hz and achieve a 1.73-foldimprovement on the average power-in-the-bucket. The experimental resultsindicate the feasibility of the real-time wavefront correction for the largemode area fiber laser by adaptive optics.

Adaptive wavefront correction of dynamic multimode beam based on modal decomposition