Abstract
Persistent spectral hole burning (PSHB) was investigated in -doped glass prepared by the sol-gel method. The hole was burned in the line of the ions using a rhodamine 6G dye laser at 77 K, the hole area of which was proportionally increased with the content of OH groups surrounding the ions. The local environment of the ions in glass was examined from the fluorescence line narrowing spectra of the transition. The three splitting energies of the level diverged with the increase of the excitation energy. It was concluded that the PSHB was formed by optically changing the bonding feature of proton in the coordinating sphere of the ions into the activated state, the barrier height of which was estimated as 0.3 eV.
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