Anti-resonant hollow core fibres for UV guidance

We summarise our progress on fabricating hollow core fibres with ${\lt}250 \mathrm{~nm}$ silica wall structures needed for UV guidance, with particular focus on deep UV guidance(${\lt}280 \mathrm{~nm}$). Through improvements in our fabrication process, we can produce thin glass walls in tubular hollow core fibres from one cane stage stack-and-draw methods that can have high yield $(1-5 \mathrm{~km})$. We have produced both single-mode and multi-mode hollow core fibres that guide most of the UV wavelength range, down to the shortest wavelength guidance achievable in air.