2 October 1997 Sm2+-doped silicate glasses: sol-gel processing and persistent spectral hole burning
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Sm2+-doped glasses in the system of Al2O3-SiO2 were prepared by the sol-gel processing of metal alkoxides and the reaction with H2 gas at 800 degrees Celsius, of which hole burning properties were investigated. Sm3+ ions-containing glasses prepared by a sol-gel method were reacted with H2 gas to form the Sm2+ ions. Fluorescence line narrowing spectra of the 5D0 yields 7F1 transition were analyzed to study the local structure surrounding the Sm2+ ion. It is concluded that the Sm2+ ions are closely coordinated with nine oxygens of the AlO6 group in aluminosilicate glasses and the addition of Al3+ ions into glass induces an increase in the coordination number of the Sm2+. The fluorescence intensity of the Sm2+ and Sm3+ ions considerably increases in glasses containing more than 5 mol% Al2O3. The holes were burned in the 7F0 yields 5D0 line of the Sm2+ ions using a DCM dye laser at 77 K. The hole depth increased with increasing the laser irradiation time, reaching up to approximately 15% of the total intensity within a few hundred seconds. The hole width was 3 cm-1 full width at half maximum at 77 K and increased with increasing temperature.
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Masayuki Nogami, Yoshihiro Abe, "Sm2+-doped silicate glasses: sol-gel processing and persistent spectral hole burning", Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); doi: 10.1117/12.279162; https://doi.org/10.1117/12.279162

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