2 MW peak power generation in fluorine co-doped Yb fiber prepared by powder-sinter technology

in: Optics Letters (2020)
Leich, Martin; Kalide, André; Eschrich, Tina; Lorenz, Martin; Lorenz, Adrian; Wondraczek, Katrin; Schönfeld, Dörte; Langner, Andreas; Schötz, Gerhard; Jäger, Matthias
We report on the first implementation of a fluorine co-doped large-mode-area REPUSIL fiber for high peak power amplification in an ultrashort-pulse master oscillator power amplifier. The core material of the investigated step-index fiber with high Yb-doping level, 52 µm core and high core-to-clad ratio of 1:4.2 was fabricated by means of the REPUSIL powder-sinter technology. The core numerical aperture was adjusted by fluorine co-doping to 0.088. For achieving high beam quality and for ensuring a monolithic seed path, the LMA fiber is locally tapered. We demonstrate an Yb fiber amplifier with near-diffraction-limited beam quality of M2 = 1.3, which remains constant up to a peak power of 2 MW. This is a record for a tapered single core fiber.

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