The aim of the present paper is to highlight the application of the spectro-scopic techniques to the characterization of rare-earth–doped glasses and to present a brief overview of the efforts and progresses made in the area of micro-optic and integrated-optic lasers and amplifiers. Thus, in the last few years, due to the great development of optical communications, an increasing research and de-velopment activity has been focused on the design and manufacture of fibre optic and integrated optic lasers and amplifiers, especially of those based on Er 3+ -doped glasses. Recently, guided-wave format has added several advantages, namely the small size, the high pump power density, and the larger flexibility in design and fabrication. Glasses have been known for a long time as a convenient host for rare earths and have been widely used for the fabrication of solid-state lasers. In the latter field, one can exploit the unique photoluminescence properties of rare-earth ions to develop novel or advanced lasers and optical amplifiers. Rare-earth elements are of interest in several high-tech and envi-ronmental application areas, the two major ones concerning magnetic and optical devices. The large value of metallization criterion indicates that the glass materials are an insulators. It was found to be decreased with increasing refractive index and decreasing band gap. The metallization criterion has been calculated on the basis of refractive index and band gap. The value of optical basicity was found to be increased with increasing refractive index and band gap energy. The optical basicity was measured on the basis of oxide ion polarizability and calculated from refractive index and band gap energy. The value of electronic polarizability and oxide ion polarizability is found to be increased with increasing refractive index and decreasing band gap energy.
The theoretical value of average electronic polarizabilty and oxide ion polarizability were calculated by using Lorentz-Lorenz equation on the basis of refractive index and band gap energy.
The refractive indices (n) and densities (ρ) of 1-y (Er 3 O 2) y glasses with y = 0.00, y = 0.005, y = 0.01, y = 0.02, y = 0.03, y = 0.04, y = 0.05 were measured at room temperature.
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