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 M2=6.5 beam into an M2=1.3 beam with 31% efficiency
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Laurent Lombard, Arnaud Brignon, Jean-Pierre Huignard, Eric Lallier, Patrick Georges. Beam cleanup in a self-aligned gradient index Brillouin cavity for high power multimode fiber amplifiers. Optics Letters, Optical Society of America, 2006, 31 (2), pp.158-160. ⟨hal-00700652⟩

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