Modal instabilities in high power fiber laser oscillators
Modal instabilities in high power fiber laser oscillators
Transverse mode competition and instabilities in high-power fiber oscillators have been studied experimentally by monitoring the dynamic power exchanges and characteristic frequencies of the transmitted fundamental mode (FM) and scattered high-order modes (HOMs) of the fiber laser cavity under CW and pulsed pumping. The FM and HOM power evolution indicates the presence of two competing effective laser cavities which result in rich output dynamics and full chaotic operation. The thermal and inversion related contributions to the observed instabilities have been identified by monitoring the associated characteristic instability frequencies under pulsed pumping. It is shown that in the transient regime, both inversion and thermal effects contribute successively to the observed power instabilities. Increasing the pump power leads to full chaotic response through an interplay between transverse and longitudinal mode instabilities.
4386-4403
Scarnera, V.
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Ghiringhelli, F.
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Malinowski, A.
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Codemard, C.A.
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Durkin, M.K.
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Zervas, M.N.
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18 February 2019
Scarnera, V.
a7e33d06-60f4-4bf7-81bc-1b1e48ea691a
Ghiringhelli, F.
773894f2-f092-452f-84ae-98e3b64aca3f
Malinowski, A.
54fd31d4-b510-4726-a8cd-33b6b2ad0427
Codemard, C.A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Durkin, M.K.
c9917856-22d8-40b0-ad28-21c484ca30ed
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Scarnera, V., Ghiringhelli, F., Malinowski, A., Codemard, C.A., Durkin, M.K. and Zervas, M.N.
(2019)
Modal instabilities in high power fiber laser oscillators.
Optics Express, 27 (4), .
(doi:10.1364/OE.27.004386).
Abstract
Transverse mode competition and instabilities in high-power fiber oscillators have been studied experimentally by monitoring the dynamic power exchanges and characteristic frequencies of the transmitted fundamental mode (FM) and scattered high-order modes (HOMs) of the fiber laser cavity under CW and pulsed pumping. The FM and HOM power evolution indicates the presence of two competing effective laser cavities which result in rich output dynamics and full chaotic operation. The thermal and inversion related contributions to the observed instabilities have been identified by monitoring the associated characteristic instability frequencies under pulsed pumping. It is shown that in the transient regime, both inversion and thermal effects contribute successively to the observed power instabilities. Increasing the pump power leads to full chaotic response through an interplay between transverse and longitudinal mode instabilities.
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oe-27-4-4386
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Accepted/In Press date: 17 November 2018
e-pub ahead of print date: 7 February 2019
Published date: 18 February 2019
Identifiers
Local EPrints ID: 429050
URI: http://eprints.soton.ac.uk/id/eprint/429050
ISSN: 1094-4087
PURE UUID: 2abe1e2d-1a12-46d7-bd8c-49837418fcac
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Date deposited: 20 Mar 2019 17:30
Last modified: 16 Mar 2024 02:41
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Contributors
Author:
V. Scarnera
Author:
F. Ghiringhelli
Author:
A. Malinowski
Author:
C.A. Codemard
Author:
M.K. Durkin
Author:
M.N. Zervas
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