Patent ID: 8724863

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 laser radiation in the fiber core; a first outer fiber cladding surrounding the inner fiber cladding, the first outer fiber cladding comprising a first section having longitudinally aligned gas-filled capillaries to provide the first outer fiber cladding with a smaller refractive index than the inner fiber cladding and a longitudinal second section that is free of capillaries; a second outer fiber cladding surrounding the first outer fiber cladding; and scattering centers provided at least in a region of the second outer fiber cladding that circumferentially surrounds the capillary-free longitudinal section of the first outer fiber cladding, wherein the scattering centers scatter laser radiation emerging from the inner fiber cladding through the first outer fiber cladding along the capillary-free longitudinal section.