The Yb-doped aluminosilicate fibers photodarkening mechanism based on the charge-transfer state excitation

A. A. Rybaltovsky; K. K. Bobkov; V. V. Velmiskin; A. A. Umnikov; I. A. Shestakova; A. N. Guryanov; M. E. Likhachev; M. M. Bubnov; E. M. Dianov

doi:10.1117/12.2038226

7 March 2014 The Yb-doped aluminosilicate fibers photodarkening mechanism based on the charge-transfer state excitation

A. A. Rybaltovsky, K. K. Bobkov, V. V. Velmiskin, A. A. Umnikov, I. A. Shestakova, A. N. Guryanov, M. E. Likhachev, M. M. Bubnov, E. M. Dianov

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Proceedings Volume 8961, Fiber Lasers XI: Technology, Systems, and Applications; 896116 (2014) https://doi.org/10.1117/12.2038226
Event: SPIE LASE, 2014, San Francisco, California, United States

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, K. K. Bobkov, V. V. Velmiskin, A. A. Umnikov, I. A. Shestakova, A. N. Guryanov, M. E. Likhachev, M. M. Bubnov, and 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); https://doi.org/10.1117/12.2038226

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