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Phase-shift evolution of the thermally-induced refractive index grating in high-power fiber laser systems induced by pump-power variations

: Stihler, C.; Jauregui, C.; Tünnermann, A.; Limpert, J.

Fulltext ()

Optics Express 26 (2018), No.15, pp.19489-19497
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

A phase shift between the modal interference pattern and the thermally-induced refractive index grating is most likely the ultimate trigger for the damaging effect of transverse mode instabilities (TMI) in high-power fiber laser systems. By using comprehensive simulations, the creation and evolution of a thermally-induced phase shift is explained and illustrated in detail. It is shown that such a phase shift can be induced by a variation of the pump power. The gained knowledge about the generation and evolution of the phase shift will allow for the development of new mitigation strategies for TMI.