An optical study of silicate glass containing and ions

The optical properties of chromium-doped sodium silicate glass synthesized under oxidizing conditions have been investigated. The method of preparation provides a large concentration of ions, but absorption and emission spectra showed that a small amount of (and ) ions are always present. The Dq-, B- and C-parameters of the crystal-field theory for the ion were obtained, confirming the glassy nature of the sample. luminescence was observed in the near-infrared region, even at room temperature, confirming the low value of the crystal-field Dq. Moreover, the high ultraviolet transparency of this matrix allows observation of a well resolved absorption spectrum of the ion.