Abstract
The zinc-tellurite glasses doped with Cr3+ ion have been synthesized using orthotelluric acid, zinc nitrate, and ammonium dichromate as raw materials. According to the yielded results, Cr3+ ions in the spectral range from 0.3 to 2.8 µm demonstrate two intense broad bands with maxima 454 and 650 nm, corresponding to the transitions 4A2g(F) → 4T1g(F) and 4A2g(F) → 4T2g(F). For the studied wavelength range the spectral dependence of the specific coefficient of Cr3+ allows establishing the minimum chromium content for achieving the determined level of optical losses in glasses. The electron paramagnetic resonance spectra of the doped glasses demonstrate that ions Cr3+ are presented both in the isolated ions and in Cr3+−Cr3+ paired in the distorted octahedral site. The optical band gap, Urbach energies, the crystal field and Racah parameters of the prepared glasses have been evaluated.
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