Long-term degradation of UV fibers using broadband light sources

Karl-Friedrich Klein; S. Heiden; Philipp Raithel; R. Yadav; Hanns Simon Eckhardt; Mathias Belz

doi:10.1117/12.2585216

5 March 2021 Long-term degradation of UV fibers using broadband light sources

Karl-Friedrich Klein, S. Heiden, Philipp Raithel, R. Yadav, Hanns Simon Eckhardt, Mathias Belz

Proceedings Volume 11635, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI; 1163505 (2021) https://doi.org/10.1117/12.2585216
Event: SPIE BiOS, 2021, Online Only

Abstract

Based on current studies with pulsed Nd-YAG lasers at 213, 266 and 355 nm, the measured UV-induced losses of multi-mode stepindex fibers can be described by multiple Gaussian shaped UV-defects. For best fitting, the peak value, center peak wavelength and Full-Width-Half-Maximum (FWHM) were variable parameter for the different absorption bands, similar to those defined by literature values. On the other hand, the damaging of multimode UV-fibers by broadband UV light-sources is still of particular interest. In addition to deuterium sources, where these losses are already described in the German DIN 58145 standard, pulsed Xe-lamps are used e.g. in spectroscopic applications for process control. Using both light-sources, the status of long-term degradation in UV fibers due to defects in their synthetic high-OH silica core and cladding will be described. However, this paper, focusses on results with the pulsed Xe-lamp and presents data for fiber-optic systems in spectroscopic applications. Transferring the above approach including the fit-function, analyses in high-OH and low-OH are carried out using broadband lightsources, regarding basic attenuation plus spectral and temporal damaging over several days. With the different light-sources, the peak values and the form of the absorption bands differ strongly, which can be explained by the overlapping of the absorption bands due to their spectral widths (especially the NBOHC at 260 nm). After discussing the differences related to different core diameters and lightsources, it is shown for the first time that the UV-induced losses are independent of the propagation angle within a step-index fiber.

Conference Presentation

Citation Download Citation

Karl-Friedrich Klein, S. Heiden, Philipp Raithel, R. Yadav, Hanns Simon Eckhardt, and Mathias Belz "Long-term degradation of UV fibers using broadband light sources", Proc. SPIE 11635, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI, 1163505 (5 March 2021); https://doi.org/10.1117/12.2585216

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