title: Mode-selective amplification in a large mode area Yb-doped fiber using a photonic lantern.
abstract: We demonstrate selective spatial mode amplification in a few mode, double-clad Yb-doped large mode area (LMA) fiber, utilizing an all-fiber photonic lantern. Amplification to multi-watt output power is achieved while preserving high spatial mode selectivity. We observe gain values of over 12 dB for all modes: LP01, LP11a, and LP11b, when amplified individually. Additionally, we investigate the simultaneous amplification of LP01+LP11aand LP11a+LP11b, and the resultant mode competition. The proposed architecture allows for the reconfigurable excitation of spatial modes in the LMA fiber amplifiers, and represents a promising method that could enable dynamic spatial mode control in high power fiber lasers.
authors.forename: S
authors.initials: S
authors.lastname: Wittek
authors.forename: R
authors.initials: R
authors.lastname: Bustos Ramirez
authors.forename: J
authors.initials: J
authors.lastname: Alvarado Zacarias
authors.forename: Z
authors.initials: Z
authors.lastname: Sanjabi Eznaveh
authors.forename: J
authors.initials: J
authors.lastname: Bradford
authors.forename: G
authors.initials: G
authors.lastname: Lopez Galmiche
authors.forename: D
authors.initials: D
authors.lastname: Zhang
authors.forename: W
authors.initials: W
authors.lastname: Zhu
authors.forename: J
authors.initials: J
authors.lastname: Antonio-Lopez
authors.forename: L
authors.initials: L
authors.lastname: Shah
authors.forename: R
authors.initials: R
authors.lastname: Amezcua Correa