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9 March 2024 Reversible photodarkening in UV-guiding hollow-core optical fibres
Robbie Mears, Kerrianne Harrington, Jonathan C. Knight, William J. Wadsworth, James M. Stone, Tim A. Birks
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Proceedings Volume PC12882, Optical Components and Materials XXI; PC128820K (2024) https://doi.org/10.1117/12.3001758
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
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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Robbie Mears, Kerrianne Harrington, Jonathan C. Knight, William J. Wadsworth, James M. Stone, and Tim A. Birks "Reversible photodarkening in UV-guiding hollow-core optical fibres", Proc. SPIE PC12882, Optical Components and Materials XXI, PC128820K (9 March 2024); https://doi.org/10.1117/12.3001758
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KEYWORDS
Optical fibers
Ultraviolet radiation
Silica
Signal attenuation
Light absorption
Rayleigh scattering
Photons
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