Patent ID: 7916991

Claim:
An optical fiber for the transmission of high-power laser radiation, comprising: a fiber core; an inner fiber cladding surrounding the fiber core and being configured to carry the high-power laser radiation in the fiber core, wherein the inner fiber cladding is constructed for carrying the high-power laser radiation in the fiber core as a result of longitudinally aligned gas-filled capillaries within the inner fiber cladding; a first outer fiber cladding surrounding the inner fiber cladding, the first outer fiber cladding having a smaller refractive index than the inner fiber cladding and having a longitudinal section that is free of capillaries; an outermost fiber cladding surrounding the first outer fiber cladding; and scattering centers provided at least in an inner space of the outermost fiber cladding that circumferentially surrounds the longitudinal section that is free of capillaries, wherein the scattering centers are arranged to scatter laser radiation emerging from the inner fiber cladding through the first outer fiber cladding along the longitudinal section that is free of capillaries.