EFFECT OF HYDROXYL BONDS ON PERSISTENT SPECTRAL HOLE-BURNING IN EU3-DOPED BAO-P2O5 GLASSES()

The effect of OH bonds on the optical absorption and persistent spectr al hole burning (PSHB) properties was quantitatively analyzed in Eu3+- doped BaO-P2O5 glasses. Glasses were prepared by melting the raw mater ial at 600-800 degrees C, in which the OH content was changed. The hol e was burned in the F-7(0)-->D-5(0) 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 t he hole depth linearly increased with increasing the OH content in the glass. The proposed model was that the hole was burned by the optical ly activated rearrangement of the OH bonds surrounding the Eu3+ ions. The hole burnt at 6 K was refilled with increasing time and temperatur e and an average thermal barrier height for the hole filling was simil ar to 140 meV, which was smaller than that for the Eu3+ ions doped in silica and silicate glasses.