title: High-power spectral beam combining of linearly polarized Tm:fiber lasers.
abstract: To date, high-power scaling of Tm:fiber lasers has been accomplished by maximizing the power from a single fiber aperture. In this work, we investigate power scaling by spectral beam combination of three linearly polarized Tm:fiber MOPA lasers using dielectric mirrors with a steep transition from highly reflective to highly transmissive that enable a minimum wavelength separation of 6 nm between individual laser channels within the wavelength range from 2030 to 2050 nm. Maximum output power is 253 W with M(2)<2, ultimately limited by thermal lensing in the beam combining elements.
authors.forename: Lawrence
authors.initials: L
authors.lastname: Shah
authors.forename: R Andrew
authors.initials: RA
authors.lastname: Sims
authors.forename: Pankaj
authors.initials: P
authors.lastname: Kadwani
authors.forename: Christina C C
authors.initials: CC
authors.lastname: Willis
authors.forename: Joshua B
authors.initials: JB
authors.lastname: Bradford
authors.forename: Alex
authors.initials: A
authors.lastname: Sincore
authors.forename: Martin
authors.initials: M
authors.lastname: Richardson