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Proceedings Paper

Thermal-recovery of modal instability in rod fiber amplifiers
Author(s): Mette Marie Jørgensen; Marko Laurila; Danny Noordegraaf; Thomas Tanggaard Alkeskjold; Jesper Lægsgaard
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Paper Abstract

We investigate the temporal dynamics of Modal instabilities (MI) in ROD fiber amplifiers using a 100 μm core rod fiber in a single-pass amplifier configuration, and we achieve ~200W of extracted output power before the onset of MI. Above the MI threshold, we investigate the temporal dynamics of beam fluctuations in both the transient and chaotic regime. We identify a set of discrete frequencies in the transient regime and a white distribution of frequencies in the chaotic regime. We test three identical rods using a multiple ramp-up procedure, where each rod is tested in three test series and thermally annealed between each test series. We find that the MI threshold degrades as it is reached multiple times, but is recovered by thermal annealing. We also find that the test history of the rods affects the temporal dynamics.

Paper Details

Date Published: 26 February 2013
PDF: 8 pages
Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86010U (26 February 2013); doi: 10.1117/12.2001413
Show Author Affiliations
Mette Marie Jørgensen, Technical Univ. of Denmark (Denmark)
Marko Laurila, Technical Univ. of Denmark (Denmark)
NKT Photonics A/S (Denmark)
Danny Noordegraaf, NKT Photonics A/S (Denmark)
Thomas Tanggaard Alkeskjold, NKT Photonics A/S (Denmark)
Jesper Lægsgaard, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 8601:
Fiber Lasers X: Technology, Systems, and Applications
Sami T. Hendow, Editor(s)

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