Abstract
We have studied photodarkening in ytterbium-doped fibre preforms with an aluminosilicate glass core. Analysis of their absorption and luminescence spectra indicates the formation of stable ions in the glass network under IR laser pumping at a wavelength and under UV irradiation with an excimer laser . We have performed comparative studies of the luminescence spectra of the preforms and crystals under excitation at a wavelength of . The mechanism behind the formation of ions and aluminium – oxygen hole centres (Al-OHCs), common to ytterbium-doped YAG crystals and aluminosilicate glass, has been identified: photoinduced charge-transfer state excitation.
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