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Proceedings Paper

Numerical studies of modal instabilities in high-power fiber amplifiers
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Paper Abstract

We present a detailed time-dependent numerical model of the modal instability phenomenon observed in Yb-doped fiber amplifiers. The thermal effects are captured by solving the heat equation in polar coordinate using a 2D, second-order, time-dependent, alternating direction implicit (ADI) method. The model captures the three power-dependent regions that are characteristic of the transfer of energy between the fundamental mode and the higherorder mode as a function of time. It is also shown that for the fiber configuration investigated, the modal instability threshold scales linearly over a wide range with the seed power. Furthermore, we present numerical results indicating that gain tailoring can increase the threshold. Two different gain-tailored fiber designs are simulated and compared.

Paper Details

Date Published: 22 March 2013
PDF: 7 pages
Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86013F (22 March 2013); doi: 10.1117/12.2006571
Show Author Affiliations
Shadi Naderi, Air Force Research Lab. (United States)
Iyad Dajani, Air Force Research Lab. (United States)
Timothy Madden, Air Force Research Lab. (United States)
Bemjamin Ward, United States Air Force Academy (United States)
Craig Robin, Air Force Research Lab. (United States)
Jake Grosek, Air Force Research Lab. (United States)


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

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