Broadband guidance of ultraviolet light in a hollow-core optical fibre

We report an anti-resonant hollow core fibre with broad-band ultraviolet guidance from 190 - 400 nm, except for a narrow high loss resonance band at 245 - 265 nm. The minimum attenuation is 0.13 dB/m at 235 nm and 0.16 dB/m at 325 nm. With an inscribed core diameter of ~ 12 $\mu$m, the fibre's bend loss was 0.22 dB per turn for a bend radius of 3 c