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We experimentally investigate the Stimulated Brillouin Scattering (SBS) beam profile in very large core (105μm) fibers with nanosecond pulse. Both phase conjugation and mode depression effect in different conditions are achieved and studied. Beam shape of step-index (SI) fiber and graded-index (GI) fiber with same parameters are contrasted. And a mode clean up mechanism in GI fiber has been suggested.
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