20 February 2014 Improvement of optical damage in specialty fiber at 266 nm wavelength
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Abstract
Improved multimode UV-fibers with core diameters ranging from 70 to 600 μm diameter have been manufactured based on novel preform modifications and fiber processing techniques. Only E’-centers at 214 nm and NBOHC at 260 nm are generated in these fibers. A new generation of inexpensive laser-systems have entered the market and generated a multitude of new and attractive applications in the bio-life science, chemical and material processing field. However, for example pulsed 355 nm Nd:YAG lasers generate significant UV-damages in commercially available fibers. For lower wavelengths, no results on suitable multi-mode or low-mode fibers with high UV resistance at 266 nm wavelength (pulsed 4th harmonic Nd:YAG laser) have been published. In this report, double-clad fibers with 70 μm or 100 μm core diameter and a large claddingto- core ratio will be recommended. Laser-induced UV-damages will be compared between these new fiber type and traditional UV fibers with similar core sizes. Finally, experimental results will be cross compared against broadband cw deuterium lamp damage standards.
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T. Tobisch, T. Tobisch, H. Ohlmeyer, H. Ohlmeyer, H. Zimmermann, H. Zimmermann, S. Prein, S. Prein, J. Kirchhof, J. Kirchhof, S. Unger, S. Unger, M. Belz, M. Belz, K.-F. Klein, K.-F. Klein, } "Improvement of optical damage in specialty fiber at 266 nm wavelength", Proc. SPIE 8938, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIV, 89380G (20 February 2014); doi: 10.1117/12.2041798; https://doi.org/10.1117/12.2041798
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