Spectroscopic Properties Of Erbium-doped Oxide And Oxyfluoride Glasses

In this thesis, the work is focused on the spectroscopic and laser properties of erbium doped oxide and oxy-fluoride glass. The component of glass is optimized and the technique is improved in order to achieve the optimal spectroscopic and laser properties.The characteristic of fluorescent glass and excited ions was introduced in the first chapter. We also interpreted the reason why the rare ions are chosen as the excited ions. The properties of energy level of Er³⁺ and the relationship between up-conversion and pump wavelength are given. The improvement of silicate, phosphate and tellurite laser glasses besides oxyfluoride glass-ceramics doped with Er³⁺ are reviewed.In the second chapter, the experiment methods are introduced, including the sample preparation procedures, physical and spectroscopic properties measurements, and the spectroscopic parameters calculation using Judd-Ofelt theory.In the experiment, the oxide glasses and oxy-fluoride glass doped with Er³⁺ and oxyfluoride glass-ceramics co-doped with Er³⁺/Yb³⁺ were fabricated by the technique of high temperature melting. The physical properties, structure, absorption and fluorescence spectra were measured. In oxide glass, with the increasing of Li₂O, the Judd-Ofelt parameter Ω₂ come to a maximum because of the effect of mixed alkali. The high concentration of Er³⁺ will prevent the growth PbF₂ minicrystal and the Er³⁺ were congregated on the surface of the PbF₂ minicrystal. The sensitizing of Yb³⁺ to Er³⁺ in Er³⁺/ Yb³⁺ co-doped oxyfluoride glasses was discussed. It is found that the FWHM around 1.5μm in Er³⁺/Yb³⁺ co-doped oxyfluoride glass-ceramics was broaden. In themeantime, the gasses show favorable chemical and physical properties. It is expected to be a favorable candidate host for broadband amplifiers.Finally, all results of present work are outlined, and it is suggested that something should be done in the next stage.