Patent ID: 7839902
Filing Date: 2010-11-23
Classification: B23K,G02B,H01S

Abstract:
1. A fibre laser system comprising; a feed through optical fibre including a core, a gain part of which is doped with a rare earth material to form an optical gain medium; at least one laser diode; pump combiner means for applying pump radiation from the laser diode to the optical gain medium and for generating a laser beam, said pump combiner means including at least one pump waveguide including a plurality of multi-mode pump fibres that are radially separated from the core, wherein the pump waveguide includes an annular-shaped tapered section that is fused to a substantially un-tapered or un-tapered feed through optical fiber and thereby becomes a cladding layer of the feed through optical fiber, and the pump waveguide includes an un-tapered section wherein the multi-mode pump fibres are optically coupled to a portion of the feed through optical fibre that includes the gain part; at least three cladding layers for protecting radiation from within the optical gain medium from damaging the laser diode; and delivery fibre means for delivering a laser beam to a workpiece, said delivery fibre means including an output section of the laser fibre system that is optically coupled to the gain part of the optical fibre.