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Controlling mode instabilities by dynamic mode excitation with an acousto-optic deflector

: Otto, Hans-Jürgen; Jauregui, Cesar; Stutzki, Fabian; Jansen, Florian; Limpert, Jens; Tünnermann, Andreas

Postprint (PDF; )

Optics Express 21 (2013), No.14, pp.17285-17298
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()
acousto-optic deflectors; beam profile; dynamic mode; mode instabilities; pointing stability; power levels; theoretical explanation; working principles

We demonstrate an approach to actively stabilize the beam profile of a fiber amplifier above the mode instability threshold. Both the beam quality and the pointing stability are significantly increased at power levels of up to three times the mode instabilities threshold. The physical working principle is discussed at the light of the recently published theoretical explanations of mode instabilities.