7 February 2008 Transmission properties of polymer optical fibers for pulsed UV laser light
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Laser spectroscopy in the UV-region below 380 nm is a powerful tool for many biomedical or analytical applications. For such purposes Polymer Optical Fibers (POFs) can be an interesting alternative to silica-based optical fibers if the transmission in the UV-A region is sufficient. In addition to high-power LED-light delivery shown in previous studies, the short and long term performance of PMMA-based POFs under pulsed UV radiation was investigated using a nitrogen laser at 337 nm and the 3rd harmonic of Nd:YAG laser at 355 nm. For thick POFs (core diameter: approx. 1000 μm), the basic (initial) low intensity UV-attenuation is in the order of less than 2 dB/m. However, a typical initial attenuation between 4 and 5 dB/m was determined using the pulsed UV-lasers. At 337 nm, the transmission for these POF is independent of intensity up to 9 MW/cm2. No photodegradation was observed, up to 180k pulses if the intensity does not exceed 6 MW/cm2. For both wavelengths, the surface damages have been observed, taking into account the differently shaped intensity-profiles.
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René Wandschneider, René Wandschneider, Karl-F. Klein, Karl-F. Klein, Georg Hillrichs, Georg Hillrichs, } "Transmission properties of polymer optical fibers for pulsed UV laser light", Proc. SPIE 6852, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VIII, 68520T (7 February 2008); doi: 10.1117/12.770604; https://doi.org/10.1117/12.770604


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