FIBRE LASER

摘要

The invention concerns a device forming a fibre power laser emitting a controlled transverse monomode radiation. The invention is characterised in that it comprises: a pump source (40), a clad amplifying optical fibre section (10) consisting of a double-clad fibre comprising a core (12) enclosed in two successive sheaths (15, 18), whereof the refractive indices are suited for defining a multimode optical structure, such that the pump wave is guided in the multimode structure of the fibre formed by the two sheaths (15, 18), two reflectors (20, 25) arranged on the ends of said section (10), consisting of diffraction gratings selected in the group comprising Bragg grating or reflecting dielectric filters, and a bandstop filter (30) capable of emitting a laser radiation centred at about 980 nm in the section.