Beam cleanup in a self-aligned gradient-index Brillouin cavity for high-power multimode fiber amplifiers

Abstract

We propose a beam cleanup setup to convert a multimode beam into a single-mode beam by use of the Brillouin effect in a multimode gradient-index (GI) fiber. Phase conjugation and beam cleanup regimes in highly multimode fibers are discussed, and the self-aligned GI fiber Brillouin cavity is presented. We report a preliminary conversion from an $M^2=6.5$ beam into an $M^2=1.3$ beam with 31% efficiency.

© 2006 Optical Society of America

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