7 February 2008 Transmission properties of polymer optical fibers for pulsed UV laser light
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Abstract
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, Karl-F. Klein, 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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