Photodarkening effect
WebThe sol-gel derived samples with 80 wt % SiO 2 do not exhibit appreciable photodarkening while the melt-quenched glasses with 56 wt % SiO 2 exhibit strong photodarkening effects at room temperature which results in reduction of their optical nonlinearity by a factor of ≅20 compared with the sol-gel derived samples. 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 …
Photodarkening effect
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WebNov 5, 2024 · In this paper, we summarize the research on photodarkening in optical fibers. The causes of photodarkening in fiber, the influence of photodarkening on fiber laser, the … WebFirst, the radiation-induced photodarkening in erbium/ytterbium co-doped optical fibre (EYDF) and the thermal effect in these irradiated EYDFs have been studied, which evidently display a reversible thermal effect. ... When the EYDF is exposed to Co 60 γ-radiation, a significant photodarkening effect can be observed due to the RIA . By ...
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 WebJan 13, 2024 · Light-induced effects in a-GexSe100-x chalcogenide glasses, i.e., photobleaching (PB), photodarkening (PD), and photoinduced structural transformations, have been investigated as a function of ...
WebThis study reports the radical elimination of the photodarkening (PD)-effect in Yb-doped fiber through deuterium loading. With deuterium pre-loading, no PD-induced excess loss of the Yb-doped fiber was observed under 915-nm pumping conditions. Moreover, the existing loss induced by the PD effect was also eliminated via deuterium loading, and the excess … WebWe examine the effect of photodarkening-induced pump light absorption on Yb-doped fiber thermal loading. In these experiments, the fiber is cladding pumped at 915nm, air cooled by natural convection, and monitored with a midinfrared thermal camera. The fiber temperature is found to correlate with progressive photodarkening. The maximum observed fiber …
WebIn the second part of the thesis, the photodarkening effect of Tm³⁺-doped NaYF₄ nanocrystals is studied. We have found that photodarkening behavior is observed in Tm³⁺-doped nanocrystals that exhibit the photon avalanche effect. Power-dependent luminescence of a single 8% Tm3+-doped nanocrystal reveals that photodarkened …
WebDec 18, 2024 · Additionally, the nonlinear effects (NLEs) [2,7] and photodarkening (PD) effects [8][9] [10] should be considered in the amplifiers. To suppress NLEs, the doping … fitting intu blindsWebJan 1, 2015 · ChG exhibits a photodarkening effect in which a red shift in the absorption edge occurs when visible light (of which the energy is larger than the bandgap of ChG) is used for illumination [18].Thus, to induce the maximal photodarkening effect of ChG, a high-power green laser (532 nm) is typically used.We obtained the transmission spectra (Fig. 3 … can i get another marriage certificatePhotodarkening 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 can i get another extension on my taxesWebMar 1, 2024 · Simultaneous photodarkening and photobleaching effects induced by 976 and 405 nm radiations, respectively, were investigated in a 1070 nm laser and compared with … fitting into tight jeansWebWe presented an experimental comparison of the core-composition difference on the suppression of the photodarkening and transverse mode instability effects. Two core-composition fibers, entailing Yb/Al/Ce and Yb/Al/P co-doped fibers, were fabricated by MCVD process combined with solution doping technique. The parameters of two fibers were … fitting inversionWebOct 1, 2003 · The main goal of this study is to investigate whether the photodarkening effect in glassy As 2 S 3 and As 2 O 3 is associated with changes in the asymmetry of the … fitting intumescent strips to existing doorsWebThis study reports the radical elimination of the photodarkening (PD)-effect in Yb-doped fiber through deuterium loading. With deuterium pre-loading, no PD-induced excess loss … can i get another ppp loan