简介：WeproposeanddemonstrateexperimentallyamultimodeoscillationQ-switchederbium-dopedfiberlaserwithafew-modefibercavity.ThedifferentcouplingprocessesofreflectionpeaksoffiberBragggratings(FBGs)whichactascavitymirrorsallowthedifferentoscillatingstates.Weobtainmicrosecondlightpulseoutputstateswhoseoscillationandoutputbeamshavedifferentmodecompositions,includinghighordermode.Suchastructureenablesthehighordermodeoscillationinthewholecavitywithanall-fiberstructure,whichhaspotentialapplicationsinmode-divisionmultiplexedsystemsandresearchofmultimodenonlineareffect.
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