DEVICE AND METHOD FOR COUPLING A LASER BEAM INTO A DOUBLE-CLAD FIBER

Abstract: a device for coupling a laser beam into a double-clad fiber includes a first birefringent optical element configured to split the laser beam into two sub-laser beams polarized along base polarization components of the first birefringent optical element, a polarization rotation device configured to adjust a polarization of the sub-laser beams to provide polarization-adjusted sub-laser beams, a second birefringent optical element configured to split each of the polarization-adjusted sub-laser beams into two sub-sub-laser beams polarized along base polarization components of the second birefringent optical element, and an in-coupling optical unit configured to couple the sub-sub-laser beams with compensated first exit angles and/or first beam displacements into an inner core of the double-clad fiber, and to couple other sub-sub-laser beams into an annular core of the double-clad fiber.

Inventor(s): Tina Gottwald, Bernd Metzger, Christoph Wieschendorf, Sebastian Pricking, Francesco D’Angelo, Sven-Silvius Schad, Julian Hellstern

CPC Classification: B23K26/064 (SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM (making metal-coated products by extruding metal ; building up linings or coverings by casting ; casting by dipping ; manufacture of composite layers by sintering metal powder ; arrangements on machine tools for copying or controlling ; covering metals or covering materials with metals, not otherwise provided for ; burners ))

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