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High-power air-clad large-mode-area photonic crystal fiber laser

J. Limpert, T. Schreiber, S. Nolte, H. Zellmer, A. Tünnermann, R. Iliew, F. Lederer, J. Broeng, G. Vienne, A. Petersson, and C. Jakobsen

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Abstract

We report on a 2.3 m long air-clad ytterbium-doped large-mode-area photonic crystal fiber laser generating up to 80 W output power with a slope efficiency of 78%. Single transverse mode operation is achieved with a mode-field area of 350 µm2. No thermo-optical limitations are observed at the extracted ~35W/m, therefore such fibers allow scaling to even higher powers.

©2003 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Scanning electron microscope images of the air-clad ytterbium-doped large-mode-area fiber; (b) close-up of core region

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Fig. 2.
Fig. 2. Calculated intensity distributions of the air-silica microstructured core without (a) and with doping (b), lines represent 2 dB differences in intensity

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Fig. 3.
Fig. 3. Laser characteristics of the high power air-clad microstructure ytterbium-doped large-mode-area fiber

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Fig. 4.
Fig. 4. Measured intensity distribution of the emitted beam of the microstructure large-modearea fiber laser

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