title: Evaluating the beam quality of double-cladding fiber lasers in applications.
abstract: We put forward a new βFLfactor, which is used exclusively in fiber lasers and is suitable to assess beam quality and choose the LP01mode as the new suitable ideal beam. We present a new simple measurement method and verify the reasonability of the βFLfactor in experiment in a 20/400 μm fiber laser. Furthermore, we use the βFLfactor to evaluate the beam quality of a 3-kW-level fiber laser. It can be concluded that βFLis a key factor not only for assessing the performance of the high-power fiber laser that is our main focus, but also for the simple measurement.
authors.forename: Ping
authors.initials: P
authors.lastname: Yan
authors.forename: Xuejiao
authors.initials: X
authors.lastname: Wang
authors.forename: Mali
authors.initials: M
authors.lastname: Gong
authors.forename: Qirong
authors.initials: Q
authors.lastname: Xiao