Dynamic BPM model for transverse modal instability
Dynamic BPM model for transverse modal instability
A new fast dynamic model for TMI investigation is presented and used to study the evolution of the internal powers, inversion and thermal gratings and the impact of relative phase shifts on the amplifier dynamics, showing the prevalence and importance of nonlinearly-induced beat-length variations. The optical field is represented in a modal basis, with overlaps with thermal field components precomputed. This allows optical propagation to be achieved with an efficient Runge-Kutta scheme, with mode coupling represented by a coupling term. This substantially reduces the computational load of the simulation. New features of TMI dynamics are revealed.
Amplifier, Fiber, Simulation, TMI
Malinowski, Andy
54fd31d4-b510-4726-a8cd-33b6b2ad0427
Codemard, Christophe A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
5 March 2021
Malinowski, Andy
54fd31d4-b510-4726-a8cd-33b6b2ad0427
Codemard, Christophe A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Malinowski, Andy, Codemard, Christophe A. and Zervas, Michalis N.
(2021)
Dynamic BPM model for transverse modal instability.
Zervas, Michalis N. and Jauregui-Misas, Cesar
(eds.)
In Fiber Lasers XVIII: Technology and Systems.
vol. 11665,
SPIE..
(doi:10.1117/12.2582851).
Record type:
Conference or Workshop Item
(Paper)
Abstract
A new fast dynamic model for TMI investigation is presented and used to study the evolution of the internal powers, inversion and thermal gratings and the impact of relative phase shifts on the amplifier dynamics, showing the prevalence and importance of nonlinearly-induced beat-length variations. The optical field is represented in a modal basis, with overlaps with thermal field components precomputed. This allows optical propagation to be achieved with an efficient Runge-Kutta scheme, with mode coupling represented by a coupling term. This substantially reduces the computational load of the simulation. New features of TMI dynamics are revealed.
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More information
Published date: 5 March 2021
Venue - Dates:
Fiber Lasers XVIII: Technology and Systems 2021, , Virtual, Online, United States, 2021-03-06 - 2021-03-11
Keywords:
Amplifier, Fiber, Simulation, TMI
Identifiers
Local EPrints ID: 481377
URI: http://eprints.soton.ac.uk/id/eprint/481377
ISSN: 0277-786X
PURE UUID: c0302d9a-54bb-4baa-8a97-b15f2e28e0fb
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Date deposited: 24 Aug 2023 16:52
Last modified: 18 Mar 2024 02:38
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Contributors
Author:
Andy Malinowski
Editor:
Michalis N. Zervas
Editor:
Cesar Jauregui-Misas
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