title: Photonic lantern adaptive spatial mode control in LMA fiber amplifiers.
abstract: We demonstrate adaptive-spatial mode control (ASMC) in few-moded double-clad large mode area (LMA) fiber amplifiers by using an all-fiber-based photonic lantern. Three single-mode fiber inputs are used to adaptively inject the appropriate superposition of input modes in a multimode gain fiber to achieve the desired mode at the output. By actively adjusting the relative phase of the single-mode inputs, near-unity coherent combination resulting in a single fundamental mode at the output is achieved.
authors.forename: Juan
authors.initials: J
authors.lastname: Montoya
authors.forename: Chris
authors.initials: C
authors.lastname: Aleshire
authors.forename: Christopher
authors.initials: C
authors.lastname: Hwang
authors.forename: Nicolas K
authors.initials: NK
authors.lastname: Fontaine
authors.forename: Amado
authors.initials: A
authors.lastname: Velázquez-Benítez
authors.forename: Dale H
authors.initials: DH
authors.lastname: Martz
authors.forename: T Y
authors.initials: TY
authors.lastname: Fan
authors.forename: Dan
authors.initials: D
authors.lastname: Ripin