Abstract
We have studied the photodarkening in active fibres with an ytterbium-doped phosphosilicate glass core under IR irradiation with a pump source and UV irradiation . 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 . The photoinduced optical loss in the fibres in the visible range is mainly due to absorption by the P-OHCs. A quantum-mechanical model is proposed for P-OHC and formation.
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