Open Access1.7-μm Tm-doped fiber laser intracavity-pumped by an erbium/ytterbium-codoped fiber laser
Author(s) -
Lu Zhang,
Junxiang Zhang,
Quan Sheng,
Yanyan Li,
Chaodu Shi,
Wei Shi,
Jianquan Yao
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.432898
Subject(s) - materials science , fiber laser , optics , slope efficiency , ytterbium , laser , laser power scaling , dispersion shifted fiber , erbium , laser diode , fiber , optoelectronics , diode , doping , fiber optic sensor , physics , composite material
In this paper, we demonstrate an efficient 1.7-μm Tm-doped fiber laser whose cavity was embedded in a 1560 nm erbium/ytterbium-codoped fiber laser cavity, which enabled bidirectional pumping and made full use of the circulating pump in the parent laser cavity. A rate equation model was developed to optimize the fiber length and output coupling for a desired output power. In the experiment, a maximum output power at 1720 nm of 1.13 W was obtained under 10 W of 976 nm diode pump power, which correlated well with our modeling. The slope efficiency from the multimode 976 nm diode pump to 1720 nm output was 13.5%, while the slope efficiency in terms of launched 1560 nm pump power reached 62.5%. By using a short Tm-doped fiber to minimize signal reabsorption, a high signal-to-noise ratio over 65 dB was achieved. The prospect for further power scaling was also discussed based on our developed model.