Jauregui, C.C.JaureguiStihler, C.C.StihlerLimpert, J.J.Limpert2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26403210.1364/AOP.385184This work presents a review on the effect of transverse mode instability in highpower fiber laser systems and the corresponding investigations led worldwide over the past decade. This paper includes a description of the experimental observations and the physical origin of this effect, as well as some of the proposed mitigation strategies.enfiber amplifiersYtterbiumbeam qualityhigh power fiber lasersoptics620journal article