15 February 2012 On the thermal origin of mode instabilities in high power fiber lasers
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Abstract
Detailed simulations on the temperature profile inside of a large mode area fiber in high power operation with mode interference are presented. These simulations show that the pump power is not homogeneously absorbed along the fiber, which in turn gives rise to an oscillating temperature profile along the fiber. This longitudinal temperature profile creates an index grating with the right period to transfer energy between the interfering modes. Two cases are analyzed: mode beating between the fundamental mode and a radially anti-symmetric mode and mode beating between the fundamental mode and a radially symmetric mode.
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Cesar Jauregui, Tino Eidam, Hans-Jürgen Otto, Fabian Stutzki, Florian Jansen, Jens Limpert, Andreas Tünnermann, "On the thermal origin of mode instabilities in high power fiber lasers", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 82370D (15 February 2012); doi: 10.1117/12.908279; https://doi.org/10.1117/12.908279
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