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- W2022870115 abstract "We have studied the photodarkening in active fibres with an ytterbium-doped phosphosilicate glass core under IR irradiation with a pump source (920 nm) and UV irradiation (193 nm). Analysis of absorption and luminescence spectra suggests that such irradiations produce phosphorus – oxygen – hole centres (P-OHCs) in the core glass network and lead to the reduction of the ytterbium ions to a divalent state (Yb{sup 2+}). The photoinduced optical loss in the fibres in the visible range (400 – 700 nm) is mainly due to absorption by the P-OHCs. A quantum-mechanical model is proposed for P-OHC and Yb{sup 2+} formation. (nonlinear optical phenomena)" @default.
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- W2022870115 date "2013-11-30" @default.
- W2022870115 modified "2023-10-13" @default.
- W2022870115 title "Role of oxygen hole centres in the photodarkening of ytterbium-doped phosphosilicate fibre" @default.
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- W2022870115 doi "https://doi.org/10.1070/qe2013v043n11abeh015216" @default.
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