Open Access2 kW high-efficiency Raman fiber amplifier based on passive fiber with dynamic analysis on beam cleanup and fluctuation
Author(s) -
Yizhu Chen,
Tianfu Yao,
Liangjin Huang,
Xiao Hu,
Jinyong Leng,
Pu Zhang
Publication year - 2020
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.383683
Subject(s) - optics , materials science , fiber laser , amplifier , laser beam quality , raman spectroscopy , laser power scaling , polarization maintaining optical fiber , optoelectronics , laser , optical fiber , fiber optic sensor , physics , laser beams , cmos
In this paper, we study the power scaling in high power continuous-wave Raman fiber amplifier employing graded-index passive fiber. The maximum output power reaches 2.087 kW at 1130 nm with an optical conversion efficiency of 90.1% (the output signal power versus the depleted pump power). To the best of our knowledge, this is the highest power in the fields of Raman fiber lasers based merely on Stokes radiation. The beam quality parameter M 2 improves from 15 to 8.9 during the power boosting process, then beam spot distortion appears at high power level. This is the first observation and analysis on erratic dynamic properties of the transverse modes in high power Raman fiber amplifier.