CPC G02B 6/02342 (2013.01) [C03B 37/0122 (2013.01); C03C 13/045 (2013.01); C03C 25/66 (2013.01); C03B 2201/03 (2013.01); C03B 2201/20 (2013.01); C03B 2201/21 (2013.01); C03B 2203/14 (2013.01); C03B 2203/16 (2013.01); C03B 2203/42 (2013.01); G02B 6/02352 (2013.01); G02B 6/02357 (2013.01)] | 20 Claims |
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.
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