Study of dopant concentrations on thermal induced mode instability in high power fiber amplifiers
Abstract
Dependence of mode instabilities (MI) on ytterbium dopant concentrations in high power fiber amplifiers has been investigated. It is theoretically shown that, by only varying the fiber length to maintain the same total small-signal pump absorption, the MI threshold is independent of dopant concentration. MI thresholds of gain fibers with ytterbium dopant concentration of 5.93X10^25/m3 and 1.02X10^26/m3 have been measured, which exhibit similar thresholds and agree with theoretical results. The result indicates that heavy doping of active fiber can be adopted to suppress nonlinear effects without decreasing MI threshold, which provides a method of maximizing the power output of fiber laser, taking into account the stimulated Brillouin scattering, stimulated Raman Scattering, and MI thresholds simultaneously.
Keywords
Cite
@article{arxiv.1511.06848,
title = {Study of dopant concentrations on thermal induced mode instability in high power fiber amplifiers},
author = {Rumao Tao and Pengfei Ma and Xiaolin Wang and Pu Zhou and Zejin Liu},
journal= {arXiv preprint arXiv:1511.06848},
year = {2016}
}
Comments
5 pages, 4 figures