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Proceedings Paper

Thermally induced mode instability in high power fiber amplifiers
Author(s): Arlee V. Smith; Jesse J. Smith
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Paper Abstract

We present a physical model that may describe the observed phenomenon of modal instability in high power fiber amplifiers. In the power range of several hundred watts, large-mode-area, cladding-pumped, Yb3+-doped fiber amplifiers (both step-index and photonic crystal fibers), exhibit a sudden transition in the output beam profile from the fundamental mode to a higher order mode. We show how this behavior can be caused by a thermally induced mode coupling that leads to exponential gain of the higher order mode, and we implement a numerical model that quantitatively predicts the instability threshold for any large-mode-area step index fiber amplifier.

Paper Details

Date Published: 15 February 2012
PDF: 5 pages
Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 82370B (15 February 2012); doi: 10.1117/12.906058
Show Author Affiliations
Arlee V. Smith, AS-Photonics, LLC (United States)
Jesse J. Smith, AS-Photonics, LLC (United States)

Published in SPIE Proceedings Vol. 8237:
Fiber Lasers IX: Technology, Systems, and Applications
Eric C. Honea; Sami T. Hendow, Editor(s)

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