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Proceedings Paper

Modal instability of rod fiber amplifiers: a semi-analytic approach
Author(s): Mette Marie Jørgensen; Kristian Rymann Hansen; Marko Laurila; Thomas Tanggaard Alkeskjold; Jesper Lægsgaard
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Paper Abstract

The modal instability (MI) threshold is estimated for four rod fiber designs by combining a semi-analytic model with the finite element method. The thermal load due to the quantum defect is calculated and used to numerically determine the mode distributions on which the expression for the onset of MIs is highly dependent. The relative intensity noise of the seed laser in an amplifier setup is used to seed the mode coupling between the fundamental and higher order mode, and lead to MI threshold values of 174 W – 348 W of extracted output power for the four rod fibers having core diameters in the range 53 μm – 95 μm.

Paper Details

Date Published: 26 February 2013
PDF: 8 pages
Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860123 (26 February 2013); doi: 10.1117/12.2001412
Show Author Affiliations
Mette Marie Jørgensen, Technical Univ. of Denmark (Denmark)
Kristian Rymann Hansen, Technical Univ. of Denmark (Denmark)
Marko Laurila, Technical Univ. of Denmark (Denmark)
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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