7 March 2014 The Yb-doped aluminosilicate fibers photodarkening mechanism based on the charge-transfer state excitation
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Abstract
We have studied the photodarkening effect in fiber preforms with an ytterbium-doped aluminosilicate glass core. The room-temperature stable Yb2+ ions formation in the glass matrix under both UV- and NIR-pumping irradiation was revealed by the method of absorption spectra analysis and the fluorescence spectroscopy technique. Comparative studies of preforms and crystals samples luminescence spectra, obtained under UV-excitation, were performed. A general mechanism of Yb2+ ions and aluminium oxygen-hole centers (Al-OHC) formation as a result of photoinduced process of Yb3+ ions excitation to "charge-transfer state" (CTS) was found for both Yb:YAG crystal and aluminosilicate glass.
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A. A. Rybaltovsky, A. A. Rybaltovsky, K. K. Bobkov, K. K. Bobkov, V. V. Velmiskin, V. V. Velmiskin, A. A. Umnikov, A. A. Umnikov, I. A. Shestakova, I. A. Shestakova, A. N. Guryanov, A. N. Guryanov, M. E. Likhachev, M. E. Likhachev, M. M. Bubnov, M. M. Bubnov, E. M. Dianov, E. M. Dianov, } "The Yb-doped aluminosilicate fibers photodarkening mechanism based on the charge-transfer state excitation", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 896116 (7 March 2014); doi: 10.1117/12.2038226; https://doi.org/10.1117/12.2038226
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