Open AccessInvestigation of the pump coupling efficiency of a side-pumping combiner based on tapered-fused method
Author(s) -
Zhixian Li,
Fu Min,
Xuemin Tian,
Xin Zhao,
Hong Li,
Zilun Chen,
Zefeng Wang,
Jinbao Chen
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.427234
Subject(s) - materials science , optics , coupling (piping) , numerical aperture , fiber , fiber laser , optical fiber , signal (programming language) , laser , optoelectronics , wavelength , physics , computer science , metallurgy , composite material , programming language
Side-pumping combiner is used for pumping double-clad fiber in various fiber laser schemes. However, its coupling efficiency and temperature characteristics suffer when pumped via a large numerical aperture (NA) pump light. We investigated the method of optimizing the coupling efficiency of a (2 + 1) ×1 combiner under a large NA pump light injection. After optimization of taper ratio and length of the pump fiber and fusion area between pump and signal fiber, the coupling efficiency increased and the temperature characteristic improved, which could be useful for fabrication of a side-pumping combiner for high-power fiber laser applications.