Open AccessSingle transverse mode laser in a center-sunken and cladding-trenched Yb-doped fiber
Author(s) -
Yehui Liu,
Fangfang Zhang,
Nan Zhao,
Xianfeng Lin,
Lei Liao,
Yibo Wang,
Jinggang Peng,
Haiqing Li,
Lüyun Yang,
Nengli Dai,
Jinyan Li
Publication year - 2018
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.26.003421
Subject(s) - materials science , cladding (metalworking) , fiber laser , optics , doping , chemical vapor deposition , laser , bend radius , plastic clad silica fiber , all silica fiber , fiber , optoelectronics , dispersion shifted fiber , bending , composite material , fiber optic sensor , physics
We report a novel center-sunken and cladding-trenched Yb-doped fiber, which was fabricated by a modified chemical vapor deposition process with a solution-doping technique. The simulation results showed that the fiber with a core diameter of 40 µm and a numerical aperture of 0.043 has a 1217 µm 2 effective mode area at 1080 nm. It is also disclosed that the leakage loss can be reduced lower than 0.01 dB/m for the LP 01 mode, while over 80 dB/m for the LP 11 mode by optimizing the bending radius as 14 cm. A 456 W laser output was observed in a MOPA structure. The laser slope efficiency was measured to be 79% and the M 2 was less than 1.1, which confirmed the single mode operation of the large mode area center-sunken cladding-trenched Yb-doped fiber.