Patent ID: 11947160
Assignee: NKT PHOTONICS A/S
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A laser system comprising a hollow core optical fiber, said optical fiber having an axial direction and a cross section perpendicular to said axial direction, said optical fiber comprising:
a hollow core region,
an inner cladding region surrounding said core region, and
an end facet at an end of the optical fiber,
where at least a portion of the optical fiber is comprised of a first type of feature comprising a void and a surrounding first silica material, said first type of feature extending along at least a part of said axial direction, said first silica material having a first chlorine concentration, c1, of about 300 ppm or less, providing that diffusion of chlorine to the end facet and resulting chlorine-induced degradation of the fiber end facet is mitigated.