@article{oai:nitech.repo.nii.ac.jp:00004592,
 author = {Nogami, Masayuki and Umehara, Naoto and Hayakawa, Tomokatsu},
 issue = {10},
 journal = {PHYSICAL REVIEW B},
 month = {Sep},
 note = {The effect of OH bonds on the optical absorption and persistent spectral hole burning (PSHB) properties was quantitatively analyzed in Eu3+-doped BaO-P2O5  glasses. Glasses were prepared by melting the raw material at 600-800°C, in which the OH content was changed. The hole was burned in the 7F0→5D0  transition of the Eu3+ ions at 6 K and the dependence of the PSHB properties on temperature and time was measured. The bond covalency between Eu3+  and oxygens decreased and the hole  depth linearly increased with increasing the OH content in the glass. The proposed model was that the hole  was burned by the optically activated rearrangement of the OH bonds surrounding the Eu3+  ions. The hole burnt at 6 K was refilled with increasing time and temperature and an average thermal barrier height for the hole  filling was ?140 meV. which was smaller than that for the Eu3+  ions doped in silica and silicate glasses., application/pdf},
 pages = {6166--6171},
 title = {Effect of hydroxyl bonds on persistent spectral hole burning in Eu31-doped BaO-P2O5 glasses},
 volume = {58},
 year = {1998}
}