Abstract
In this present study, Li2O–Al2O3–B2O3 glass matrix doped with a small percentage of TiO2 (ranging from 0 to 1 mol%) was prepared and characterized by X-Ray Diffraction (XRD), FTIR and Differential Scanning Calorimetric (DSC) techniques. After that, Optical Absorption (OA), Photo Luminescence (PL), Electron Paramagnetic Resonance (EPR) and Second Harmonic Generation (SHG) have been performed as a function of TiO2 concentration. The outcome of these studies spelled out different oxidation states of Ti ions. However, sample containing up to about 0.8 mol% of the TiO2, mostly will be in the state of Ti4+ with substitutional octahedral arrangement in the glass chain and is responsible for PL. Beyond this percentage, it is noticed that some parts of Ti ions reduced Ti4+ to Ti3+ state. The results of Photo-Induced Second Harmonic Generation (PSHG) together with other spectroscopic studies were discussed for all chosen samples and indicated that the Photo-Induced Birefringence (PIB) of sample with 0.8 mol% TiO2 is the most suitable for NLO (non-linear optics) devices.
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