Open AccessGain-tailored Yb/Ce codoped aluminosilicate fiber for laser stability improvement at high output power
Author(s) -
Fangfang Zhang,
Yibo Wang,
Xianfeng Lin,
Yongshi Cheng,
Zhilun Zhang,
Yehui Liu,
Lei Liao,
Yingbin Xing,
Yang Liu,
Nengli Dai,
Haiqing Li,
Jinyan Li
Publication year - 2019
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.27.020824
Subject(s) - materials science , fiber laser , optics , plastic clad silica fiber , laser beam quality , photodarkening , optoelectronics , slope efficiency , laser , amplifier , laser power scaling , fiber , optical fiber , plastic optical fiber , fiber optic sensor , composite material , laser beams , physics , cmos
A gain-tailored Ge-free Yb/Ce codoped aluminosilicate fiber is fabricated by MCVD combined with solution doping technique. Through regulating the temperature in the tube and designing the solution doping process, the refractive index profile of this fiber is close to a step-index without any center dip. The laser performance of this fiber is proved through contrast experiments with conventional fiber in a kW-level MOPA setup. The gain-tailored fiber amplifier presents a beam quality of M 2 ~1.43 at 1.2 kW. Its MI threshold is 1.25 kW, about 1.74 times as much as that of the conventional fiber amplifier. The laser slope efficiency of the gain-tailored fiber amplifier is 86.75%. Stabilized at an output power of 1.1 kW for 15 hours, the MI threshold does not decrease after this long-term operation, demonstrating a strong resistance to photodarkening effect. These results have confirmed that MCVD-fabricated gain-tailored Yb/Ce codoped aluminosilicate fibers have great potential in power scaling and output stability of high-power fiber lasers and amplifiers.