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Investigations of mode instabilities in low-NA reduced mode overlap photonic crystal fibers

: Haarlammert, N.; Sattler, B.; Liem, A.; Strecker, M.; Nold, J.; Schreiber, T.; Eberhardt, R.; Tünnermann, A.; Ludewigt, K.; Jung, M.

Optical Society of America -OSA-, Washington/D.C.:
European Conference on Lasers and Electro-Optics 2015 : European Quantum Electronics Conference, Munich, Germany, 21–25 June 2015
Washington, DC: OSA, 2015
ISBN: 978-1-4673-7475-0
Paper CJ 10 3
European Conference on Lasers and Electro-Optics (CLEO Europe) <2015, Munich>
European Quantum Electronics Conference (EQEC) <2015, Munich>
Conference Paper
Fraunhofer IOF ()

Average power scaling with excellent beam quality out of fibers is currently limited by a threshold-like degradation of beam quality at a certain power level caused by dynamic energy transfer from the fundamental mode to higher order modes [1]. This effect is called mode instabilities (MI) and it is generally agreed that MI is caused by thermally induced index gratings, where the heating due to photo-darkening might play an important role [2]. Here we investigate MI for a reduced mode overlap (RMO) fiber design, promising very low photo-darkening properties [3]. The investigations are related to passive mitigation strategies regarding scaling of the mode field diameter, bending and seed excitation.