Thulium fiber lasers with longitudinally modified concentration
Thulium fiber lasers with longitudinally modified concentration
High-power fiber lasers generate local heat load extremes during their operation, which increase the fiber temperature and lead to adverse thermal effects, such as transverse mode instability or cladding/coating thermal damage. The local temperature extremes are usually located near the end of a fiber where the pump power is delivered. In this paper, longitudinally inhomogeneous doping concentration profiles are applied to reduce the heat load extremes. Utilizing a new degree of freedom, it is shown by both simulations and measurements that maximal temperature along the fiber can be effectively decreased by using active fibers with an increasing concentration profile in the direction of pumping power. The concept is studied by a comprehensive numerical model that considers temperature-dependent parameters and is also demonstrated by measurement on an in-house built thulium-doped fiber laser formed by spliced sections with different concentrations. The output power of 54 W with the slope efficiency exceeding 62 % was reached.
concentration profile, fiber laser, heat load, temperature, thulium
Švejkarová, Bára
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Grábner, Martin
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Aubrecht, Jan
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Švejkar, Richard
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Pokorný, Jan
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Kamrádek, Michal
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Podrazký, Ondřej
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Kašík, Ivan
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Honzátko, Pavel
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Clarkson, Andrew
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Peterka, Pavel
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Švejkarová, Bára
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Grábner, Martin
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Aubrecht, Jan
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Švejkar, Richard
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Pokorný, Jan
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Kamrádek, Michal
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Podrazký, Ondřej
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Kašík, Ivan
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Honzátko, Pavel
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Clarkson, Andrew
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Peterka, Pavel
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Švejkarová, Bára, Grábner, Martin, Aubrecht, Jan, Švejkar, Richard, Pokorný, Jan, Kamrádek, Michal, Podrazký, Ondřej, Kašík, Ivan, Honzátko, Pavel, Clarkson, Andrew and Peterka, Pavel
(2025)
Thulium fiber lasers with longitudinally modified concentration.
High Power Laser Science and Engineering.
(doi:10.1017/hpl.2025.10051).
Abstract
High-power fiber lasers generate local heat load extremes during their operation, which increase the fiber temperature and lead to adverse thermal effects, such as transverse mode instability or cladding/coating thermal damage. The local temperature extremes are usually located near the end of a fiber where the pump power is delivered. In this paper, longitudinally inhomogeneous doping concentration profiles are applied to reduce the heat load extremes. Utilizing a new degree of freedom, it is shown by both simulations and measurements that maximal temperature along the fiber can be effectively decreased by using active fibers with an increasing concentration profile in the direction of pumping power. The concept is studied by a comprehensive numerical model that considers temperature-dependent parameters and is also demonstrated by measurement on an in-house built thulium-doped fiber laser formed by spliced sections with different concentrations. The output power of 54 W with the slope efficiency exceeding 62 % was reached.
Text
thulium-fiber-lasers-with-longitudinally-modified-concentration
- Accepted Manuscript
More information
e-pub ahead of print date: 18 July 2025
Keywords:
concentration profile, fiber laser, heat load, temperature, thulium
Identifiers
Local EPrints ID: 505495
URI: http://eprints.soton.ac.uk/id/eprint/505495
ISSN: 2095-4719
PURE UUID: 9b5a80a8-c582-423f-b764-7345fdb3c88d
Catalogue record
Date deposited: 10 Oct 2025 16:34
Last modified: 11 Oct 2025 02:18
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Contributors
Author:
Bára Švejkarová
Author:
Martin Grábner
Author:
Jan Aubrecht
Author:
Richard Švejkar
Author:
Jan Pokorný
Author:
Michal Kamrádek
Author:
Ondřej Podrazký
Author:
Ivan Kašík
Author:
Pavel Honzátko
Author:
Andrew Clarkson
Author:
Pavel Peterka
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