We report the appearance of reversible photodarkening (solarisation) in anti-resonant hollow-core optical fibres transmitting ultraviolet light in spectral bands down to 195 nm. Over time the effect reduces transmission in a band of wavelengths centred around 325 nm, with a 50% reduction in transmission after 4 hours in 4.85 m of fibre carrying 100-200 nW of continuous-wave broadband UV light. Transmission at the affected wavelengths recovers over days and weeks, in contrast to the well-known permanent photodarkening of solid-core fibres.
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Mears et al. (2024) studied this question.
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