title: First selective mode excitation and amplification in a ribbon core optical fiber.
abstract: We propose and demonstrate amplification of a single high-order mode in an optical fiber having an elongated, ribbon-like core having an effective mode area of area of 600 µm(2) and an aspect ratio of 13:1. When operated as an amplifier, the double-clad, ytterbium doped, photonic crystal fiber produced 50% slope efficiency and a seed-limited power of 10.5 W, corresponding to a gain of 24 dB. The high order mode remained pure through 20 dB of gain without intervention or realignment.
authors.affiliation: Lawrence Livermore National Lab, L-491, PO Box 808, Livermore, California 94551, USA. drachenberg1@llnl.gov
authors.forename: Derrek R
authors.initials: DR
authors.lastname: Drachenberg
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Messerly
authors.forename: Paul H
authors.initials: PH
authors.lastname: Pax
authors.forename: Arun
authors.initials: A
authors.lastname: Sridharan
authors.forename: John
authors.initials: J
authors.lastname: Tassano
authors.forename: Jay
authors.initials: J
authors.lastname: Dawson
mesh_terms: D000669:Amplifiers, Electronic; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers