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Optimizing high-power Yb-doped fiber amplifier systems in the presence of transverse mode instabilities

 
: Jauregui, C.; Otto, H.-J.; Breitkopf, S.; Limpert, J.; Tünnermann, A.

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Fulltext (PDF; )

Optics Express 24 (2016), No.8, pp.7879-7892
ISSN: 1094-4087
Bundesministerium für Bildung und Forschung BMBF
PT-VDI, TEHFA II
European Commission EC
FP7-IDEAS-ERC; 617173; ACOPS
Advanced Coherent Ultrafast Laser Pulse Stacking
English
Journal Article, Electronic Publication
Fraunhofer IOF ()

Abstract
The average output power of Yb-doped fiber amplifier systems is currently limited by the onset of transverse mode instabilities. Besides, it has been recently shown that the transverse mode instability threshold can be significantly reduced by the presence of photodarkening in the fiber. Therefore, reducing the photodarkening level of the core material composition is the most straightforward way to increase the output average power of fiber amplifier systems but, unfortunately, this is not always easy or possible. In this paper we present guidelines to optimize the output average power of fiber amplifiers affected by transverse mode instabilities and photodarkening. The guidelines derived from the simulations do not involve changes in the composition of the active material (except for its doping concentration), but can still lead to a significant increase of the transverse mode instability threshold. The dependence of this parameter on the active ion concentration and the core conformation, among others, will be studied and discussed.

: http://publica.fraunhofer.de/documents/N-404313.html