Patent ID: 8781269

Claim:
A method for generating a laser beam ( 3 ) with different beam profile characteristics, characterised in that: a laser beam ( 2 ; 61 , 62 ) is coupled into the fibre end ( 1 a ) of a multi-clad fibre ( 1 ), in particular a double-clad fibre, and emitted from the other fibre end ( 1 b ) of the multi-clad fibre ( 1 ), and for the generation of different beam profile characteristics of the output laser beam ( 3 ), either the input laser beam ( 2 ; 61 , 62 ) is electively either coupled at least into the inner fibre core ( 4 ) of the multi-clad fibre ( 1 ) or at least into at least one outer ring core ( 6 ) of the multi-clad fibre ( 1 ) or, electively, a first laser beam ( 61 ) is coupled at least into the inner fibre core ( 4 ) of the multi-clad fibre ( 1 ) and a different, second laser beam ( 62 ) is coupled at least into at least one outer ring core ( 6 ) of the multi-clad fibre ( 1 ).