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. Fig, Beam shapes: (a) incident pump beam; (b) reflected Stokes beam (LP 11 mode)

. Fig, Power threshold decrease in a closed Brillouin cavity relative to the open Brillouin cavity as a function of the coupling coefficient r for cw and Qcw operation

. Fig, (a) Pump beam shape emitted by the multimode fiber amplifier and (b) Stokes beam shapes in the far field