Open AccessModeling Er/Yb fiber lasers at high powers
Author(s) -
Liang Dong,
Turghun Matniyaz,
Monica T. Kalichevsky-Dong,
Johan Nilsson,
Yoonchan Jeong
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.393853
Subject(s) - ytterbium , lasing threshold , materials science , ion , fiber laser , erbium , rate equation , laser , optics , energy transfer , clamping , atomic physics , doping , optoelectronics , physics , quantum mechanics , kinetics , mechanical engineering , engineering
Conventional models of Er/Yb co-doped fibers assume all ytterbium ions are equally involved in the energy transfer with erbium ions, governed by a singular transfer rate. This would predict output power clamping once ytterbium parasitic lasing starts, contrary to the observations that the output continued to grow albeit at a slower rate. One study explained this using elevated temperature at high powers. Our study, however, shows that elevated temperature and mode-dependent effects only play insignificant roles. A new model is developed based on the existence of isolated ytterbium ions, which can explain all the observed experimental behaviors.