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Yb-doped large-pitch fibres: Effective single-mode operation based on higher-order mode delocalisation

: Limpert, Jens; Stutzki, Fabian; Jansen, Florian; Otto, Hans-Jürgen; Eidam, Tino; Jauregui, Cesar; Tünnermann, Andreas


Light. Online resource 1 (2012), Nr.e8, 5 S.
ISSN: 2047-7538
Fraunhofer IOF ()
higher-order mode delocalisation; high-power fibre lasers and amplifiers; photonic-crystal fibre; very large mode area

Rare earth-doped fibres are a diode-pumped, solid-state laser architecture that is highly scalable in average power. The performance of pulsed fibre laser systems is restricted due to nonlinear effects. Hence, fibre designs that allow for very large mode areas at high average powers with diffraction-limited beam quality are of enormous interest. Ytterbium-doped, rod-type, large-pitch fibres (LPF) enable extreme fibre dimensions, i.e., effective single-mode fibres with mode sizes exceeding 100 times the wavelength of the guided radiation, by exploiting the novel concept of delocalisation of higher-order transverse modes. The non-resonant nature of the operating principle makes LPF suitable for high power extraction. This design allows for an unparalleled level of performance in pulsed fibre lasers.