Abstract
It is expected that persistent spectral hole burning (PSHB) will be applied for a high-density data storage system and it can serve as a powerful method for studying the local structure around optical centers. The authors' group has discovered a room-temperature PSHB material for Sm2+-doped glasses. The present work investigated the relationship between the Debye temperature of the glass and the hole width, and the effects of alkali ions on hole burning for alkali borate glasses. Sm2+-doped glasses were produced in a strongly reducing atmosphere. Hole burning was measured for the 5D0-7F0 transition of the Sm2+ ion. The hole width decreased with increasing Debye temperature which is a parameter of the bond strength of glass network former. The hole width for borate glasses was more closely related to the local structure around the Sm2+ ion than to the glass matrix. The hole depth increased with increasing optical basicity of glasses. The hole burning mechanism in Sm2+-doped glasses seemed to be the photo-ionization of Sm2+ → Sm3+ + e−.
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