Persistent spectral hole burning at temperatures up to 200 K was first time observed in -ion-doped aluminosilicate glass. Glass having a composition of 2-wt. % -containing was prepared by heating the gel synthesized from metal alkoxides at 900 °C. The persistent spectral holes were burned in the line of the ions by a dye laser with a bandwidth of ∼1 of which width and depth were ∼3 and ∼10% of the total fluorescence intensity, respectively, at 77 K. It was found that the hole depth decreased with increasing temperature and was erased above 220 K. The local environment of the ions in glass is discussed with regard to the fluorescence line narrowing spectra of the transition.
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