Open Access740-watt level optical tap coupler using side-polished large-mode-area double clad fibers for a high power fiber laser
Author(s) -
Hwanseong Jeong,
Junsu Lee,
Kwang Hyun Lee,
Dong Joon Kim,
Joonhoi Koo,
Jung Hwan Lee,
Minsik Jo
Publication year - 2021
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.430284
Subject(s) - materials science , optics , output coupler , optical fiber , laser , coupling loss , power dividers and directional couplers , fiber laser , single mode optical fiber , coupling (piping) , optoelectronics , composite material , physics
We fabricated a fiber-optic directional coupler based on evanescent field coupling between side-polished large mode area (LMA) double clad fibers (DCFs) for a high power fiber laser. The tapping ratio of the fabricated coupler was measured to be - 32 dB. The fundamental mode coupled in a core of the lower side-polished fiber (SPF) was transferred to the upper SPF without clad-mode coupling. Two SPFs were directly faced to increase an optical handling power up to 740 W. The tapping ratio of the coupler was constantly maintained at the applied laser output. The beam quality of the laser including the fabricated coupler was maintained to be 1.22, without mode distortion by the coupler.