Transverse-modal-instability gain in high power fiber amplifiers: Effect of the perturbation relative phase
Transverse-modal-instability gain in high power fiber amplifiers: Effect of the perturbation relative phase
Local transverse modal instability (TMI) gain has been derived by carrying out a stability analysis of the fundamental mode amplification in high power fiber amplifiers, in the presence of spatial (transverse) and temporal perturbations, taking into account the gain saturation and resulting thermal loading. We have shown that the relative phase between the fundamental fiber mode and the transverse perturbation significantly affects the local TMI gain. By controlling the relative phase, the TMI gain can be reduced significantly, with the gain variation being more pronounced as the core diameter increases. This finding can be used in conjunction with other proposed approaches to develop efficient strategies for mitigating TMI in high power fiber amplifiers and lasers.
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
2019
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Zervas, Michalis N.
(2019)
Transverse-modal-instability gain in high power fiber amplifiers: Effect of the perturbation relative phase.
APL Photonics, 4 (2), [022802].
(doi:10.1063/1.5050523).
Abstract
Local transverse modal instability (TMI) gain has been derived by carrying out a stability analysis of the fundamental mode amplification in high power fiber amplifiers, in the presence of spatial (transverse) and temporal perturbations, taking into account the gain saturation and resulting thermal loading. We have shown that the relative phase between the fundamental fiber mode and the transverse perturbation significantly affects the local TMI gain. By controlling the relative phase, the TMI gain can be reduced significantly, with the gain variation being more pronounced as the core diameter increases. This finding can be used in conjunction with other proposed approaches to develop efficient strategies for mitigating TMI in high power fiber amplifiers and lasers.
Text
1.5050523
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Accepted/In Press date: 25 September 2018
e-pub ahead of print date: 11 December 2018
Published date: 2019
Identifiers
Local EPrints ID: 427137
URI: http://eprints.soton.ac.uk/id/eprint/427137
ISSN: 2378-0967
PURE UUID: 50f49757-2ab0-4ef9-ac8e-6888989cdf49
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Date deposited: 03 Jan 2019 17:30
Last modified: 18 Mar 2024 02:38
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