WebDec 1, 2024 · It was found that the sample fabricated using the powder derived with (NH 4) 2 SO 4 as a dispersant still exhibited photodarkening effect, as shown in Fig. 8. After irradiation by the 940 nm laser diode, a cross-like dark area became observable on the ceramic slab, while no photodarkening was observed on the sample fabricated using PAA … WebThe photodarkening effect normally appears to be permanent, although it has been demonstrated that it can be reversed by heating the fiber [18] or by irradiation with ultraviolet light [19]. Further studies will hopefully reveal …
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WebAcademia.edu is a platform for academics to share research papers. Webphotodarkening effect, which manifests as a time dependent increase of loss in the doped core, is one of the main threats to the efficiency of the Yb-doped gain media leading to degradation of the laser performance. This thesis focused on developing accurate methods to characterize photodarkening and the how do i know if i have medi cal
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Photodarkening is an optical effect observed in the interaction of laser radiation with amorphous media (glasses) in optical fibers. Until now, such creation of color centers was reported only in glass fibers. Photodarkening limits the density of excitations in fiber lasers and amplifiers. The experimental results … See more One could expect the term photodarkening to refer to any process when any object becomes non-transparent (dark) due to illumination with light. Formally, the darkening of the photo-emulsion also could be considered … See more The phenomenon, similar to photodarkening in fibers, was recently observed in chunks of Yb-doped ceramics and crystals. At the high concentration of excitations, the See more The inverse of the timescale at which photodarkening occurs can be interpreted as photodarkening rate. See more Usually, photodarkening is attributed to creation of color centers due to resonant interaction of electromagnetic field with an active medium. See more WebThe radical elimination of photodarkening effect by H2-loading was demonstrated, and the output power was stable during long term operation in high power fiber amplifiers, without … WebPhotodarkening effect of an ytterbium fibre under different pump wavelength. 2.3 Time behavior of photodarkening Photodarkening is an effect that occurs strongly at the beginning and then decreases to reach a stable value. how do i know if i have mercury fillings