Open AccessFlat-top mode from a 50 µm-core Yb-doped leakage channel fiber
Author(s) -
Fanting Kong,
Guancheng Gu,
Thomas Hawkins,
Joshua Parsons,
Mervyn Jones,
Christopher Dunn,
Monica T. Kalichevsky-Dong,
Kanxian Wei,
Bryce Samson,
Liang Dong
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.032371
Subject(s) - materials science , optics , hard clad silica optical fiber , core (optical fiber) , optical fiber , fiber laser , plastic clad silica fiber , all silica fiber , doping , graded index fiber , leakage (economics) , fiber , mode volume , optoelectronics , fiber optic sensor , composite material , physics , macroeconomics , economics
We demonstrate for the first time a flat-top mode from a 50 µm-core Yb-doped leakage channel fiber (LCF). The flat intensity distribution leads to an effective mode area of ~1880 µm(2) in the straight fiber, an over 50% increase comparing to that of regular LCF with the same core diameter. The flat-top mode was achieved by using a uniform Yb-doped silica glass in the core center with an index of ~2 × 10(-4) lower than that of the silica background. The fiber was also tested in a laser configuration, demonstrating an optical-to-optical efficiency of ~77% at 1026 nm with respect to the pump at 975 nm.