Abstract

The first demonstration of a 40 μm core homogeneously ytterbium-doped fully aperiodic large-pitch fiber laser, to the best of our knowledge, is reported here. In this concept, the amplification of unwanted high-order modes is prevented by means of an aperiodic inner-cladding structure, while the core and inner-cladding material has a higher refractive index than pure silica. In a laser configuration, up to 252 W of extracted power, together with an optical-to-optical efficiency of 63% with respect to the incident pump power, have been achieved. While an average $M^2$ of 1.4 was measured, the emitted power becomes temporally unstable when exceeding 95 W, owing to the occurrence of modal instabilities.

© 2016 Optical Society of America

Polarization-maintaining Yb-doped large-mode-area fully aperiodic large-pitch fibers

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Precompensation of the thermal-induced refractive index changes into a fully aperiodic LPF for heat load resilience

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Impact of thermal lensing on the TMI threshold powers in rod-type Yb-doped fiber amplifiers

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The influence of index-depressions in core-pumped Yb-doped large pitch fibers

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