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26 February 2013 Modal instability of rod fiber amplifiers: a semi-analytic approach
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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.
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Mette Marie Jørgensen, Kristian Rymann Hansen, Marko Laurila, Thomas Tanggaard Alkeskjold, and Jesper Lægsgaard "Modal instability of rod fiber amplifiers: a semi-analytic approach", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860123 (26 February 2013);

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