A high average power laser device equipped with a fiber

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The disclosure relates to a laser device having a fibre emitting a single-mode transverse radiation controlled at a given wavelength, which includes : at least one laser diode capable of emitting a pump wave and a sheathed amplifying optic-fibre segment having two ends, the amplifying optic fibre including a core and a pumping sheath, the fibre being doped with a rare-earth dopant, wherein the core of the fibre has a diameter of between 12 μm and 200 μm, and in that the device includes : a coupling means for coupling the pump wave in the pumping sheath to at least one end of the fibre, and a resonator capable of re-injecting a laser beam at the given wavelength at the two ends of said segment, said resonator including an intra-cavity wavelength selective means capable of interaction with the injection means so as to perform a filtration on the given wavelength and re-inject into the fibre the pump wave which has not been absorbed after passing in the fibre.