Open AccessExperimental analysis of Raman-induced transverse mode instability in a core-pumped Raman fiber amplifier
Author(s) -
Victor Distler,
Friedrich Möller,
Benjamin Yildiz,
Marco Plötner,
César Jáuregui,
Till Walbaum,
Sabu Thomas
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.424842
Subject(s) - raman spectroscopy , raman scattering , optics , materials science , fiber laser , core (optical fiber) , instability , transverse mode , fiber , double clad fiber , coherent anti stokes raman spectroscopy , transverse plane , laser , polarization maintaining optical fiber , optical fiber , physics , fiber optic sensor , structural engineering , mechanics , composite material , engineering
The effect of transverse mode instability is a limitation for the power scaling of fiber laser systems, that can originate due to heat caused by stimulated Raman scattering. In this contribution, we experimentally investigate the threshold of transverse mode instability caused by stimulated Raman scattering in a passive fiber. Both, the Stokes seed power and the fiber length of a core-pumped Raman fiber amplifier are varied to systematically study this effect. Mode resolved measurements reveal that the threshold occurs at approximately the same Stokes output power for all tested configurations, independent of the total Raman conversion efficiency. These results increase the understanding of this type of mode instability and show which parameters are important for a further power scaling of high-power Raman fiber amplifiers.