3 March 2017 Short- and long-term damage and annealing of improved UV-fibers using broadband UV light-source
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Abstract
A new generation of multimode UV-fibers with reduced solarization defects featuring core diameters ranging from 70 to 600 μm diameter have been manufactured by optimizing fiber drawing and processing techniques. Generated by D2-lamp light, UV-induced losses at 214 nm saturation levels below 0.5 dB have been achieved for 2 m long samples after 4 hours. However, it was found that UV-induced loss is increasing slightly after 24 hours.

For applications in analytics or sensing, a plasma-based laser-driven light source has been introduced as an alternative to D2-lamps. However, the UV-defect concentration after 4 hours was found to be lower despite significantly higher spectral power density. Annealing effects due to VIS- and IR-light portion of the new lamp may have to be taken into account.

For the first time, we are concentrating on the short-term (< 20 min) effects of UV damaging in different UV-fibers due to different spectra; especially light power above 400 nm will be blocked or at least significantly reduced. In addition, the long-term behavior with both lamps and the effect on fiber core diameter is presented.
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Philipp Raithel, Philipp Raithel, Arne Zimmer, Arne Zimmer, Karl-Friedrich Klein, Karl-Friedrich Klein, Mathias Belz, Mathias Belz, } "Short- and long-term damage and annealing of improved UV-fibers using broadband UV light-source", Proc. SPIE 10058, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII, 1005811 (3 March 2017); doi: 10.1117/12.2257517; https://doi.org/10.1117/12.2257517
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