Influence of pedestal diameter on mode instabilities in Yb/Ce/Al-doped fibers
Moeller F, Distler , Walbaum T, Haarlammert N, Nold J, Schreiber T, Unger S, Reichel , Kobelke J, Bierlich J, Schwuchow A, Eschrich T, Leich M, Wondraczek K, Tuennermann A (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 28
Pages Range: 33456-33474
Journal Issue: 22
DOI: 10.1364/OE.403460
Abstract
In this paper we present numerical and experimental results revealing that the mode instability threshold of highly Yb-doped, Ce/Al co-doped pedestal fibers is affected by the size of the index-increased pedestal structure surrounding the core. An alternative preparation technology for the realization of large mode area fibers with very large Al-doped silica pedestals is introduced. Three different pedestal fiber design iterations characterized by low photodarkening were manufactured and tested in counter-pumped amplifier setups. Up to 1.9 kW continuouswave output power of near-diffraction-limited beam quality (M2 = 1.26) was achieved with an 18/200/420 μm fiber of very low NA = 0.042, limited only by the occurrence of mode instabilities.
Involved external institutions
Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF) / Fraunhofer Institute for Applied Optics and Precision Engineering
Germany (DE)
Leibniz-Institut für Photonische Technologien e.V.
Germany (DE)
Germany (DE)
Leibniz-Institut für Photonische Technologien e.V.
Germany (DE)
How to cite
APA:
Moeller, F., Distler, ., Walbaum, T., Haarlammert, N., Nold, J., Schreiber, T.,... Tuennermann, A. (2020). Influence of pedestal diameter on mode instabilities in Yb/Ce/Al-doped fibers. Optics Express, 28(22), 33456-33474. https://dx.doi.org/10.1364/OE.403460
MLA:
Moeller, F., et al. "Influence of pedestal diameter on mode instabilities in Yb/Ce/Al-doped fibers." Optics Express 28.22 (2020): 33456-33474.
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