Influence of pedestal diameter on mode instabilities in Yb/Ce/Al-doped fibers
| Autor: | Jens Kobelke, Friedrich Möller, Jörg Bierlich, Volker Reichel, Thomas Schreiber, Anka Schwuchow, Martin Leich, Nicoletta Haarlammert, Victor Distler, Sonja Unger, Andreas Tünnermann, Johannes Nold, Tina Eschrich, Till Walbaum, Katrin Wondraczek |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
fiber optic
Materials science business.industry Amplifier Doping 02 engineering and technology Chemical vapor deposition 021001 nanoscience & nanotechnology diffraction-limited beams 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Core (optical fiber) Pedestal Optics 0103 physical sciences Photodarkening continuous wave Laser beam quality Fiber 0210 nano-technology business mode instabilities counter-pumped amplifiers |
| Popis: | 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 continuous-wave 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. |
| Databáze: | OpenAIRE |
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