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Modal instabilities in high power fiber laser oscillators

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.

1094-4087
4386-4403
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.
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), 4386-4403. (doi:10.1364/OE.27.004386).

Record type: Article

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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More information

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
ORCID for V. Scarnera: ORCID iD orcid.org/0000-0001-8646-7063
ORCID for M.N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 20 Mar 2019 17:30
Last modified: 28 Apr 2022 01:35

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Contributors

Author: V. Scarnera ORCID iD
Author: F. Ghiringhelli
Author: A. Malinowski
Author: C.A. Codemard
Author: M.K. Durkin
Author: M.N. Zervas ORCID iD

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