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Proceedings Paper

Large flattened-mode optical fiber for reduction of nonlinear effects in optical fiber lasers
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Paper Abstract

We have developed and demonstrated a large flattened mode (LFM) optical fiber, which raises the threshold for non-linear interactions in the fiber core by a factor of 2.5 over conventional large mode area fiber amplifiers. The LFM fiber works by incorporating a raised index ring around the outer edge of the fiber core, which serves to flatten the fundamental fiber mode from a Bessel function to a top hat function. This increases the effective area of the core intersected by the mode by a factor of 2.5 without increasing the physical size of the core. This is because the core is uniformly illuminated by the LFM mode rather than having most of the light confined to the center of the core. We present experimental and theoretical results relating to this fiber and its design.

Paper Details

Date Published: 7 June 2004
PDF: 8 pages
Proc. SPIE 5335, Fiber Lasers: Technology, Systems, and Applications, (7 June 2004); doi: 10.1117/12.529746
Show Author Affiliations
Jay Walter Dawson, Lawrence Livermore National Lab. (United States)
Raymond Beach, Lawrence Livermore National Lab. (United States)
Igor Jovanovic, Lawrence Livermore National Lab. (United States)
Benoit Wattellier, Lawrence Livermore National Lab. (United States)
Zhi M. Liao, Lawrence Livermore National Lab. (United States)
Stephen A. Payne, Lawrence Livermore National Lab. (United States)
Christopher P. J. Barty, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 5335:
Fiber Lasers: Technology, Systems, and Applications
L. N. Durvasula, Editor(s)

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