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Title: Optical spectroscopy of Ti³⁺ and Cr³⁺ in some crystalline and glassy materials
Author: Rasheed, Fareed F.
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 1988
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This thesis reports optical absorption and luminescence studies of Ti³+ doped glasses and ionic crystals and of Cr³+-doped glasses. The ion-lattice coupling of Ti³+ in Al 203, YAl03 and YAG was studied via the temperature dependence of the optical spectra, the different coupling strengths being reflected in the optical properties of these systems. A comparison of the relative quantum efficiencies in these crystals showed that the excited state decay of Ti³+ in YAJ03 is purely radiative up to T = 300K, in contrast to the behaviour in Al 203 and YAG. Absorption and time resolved luminescence measurements were also carried out for Ti³+ doped phosphate glass of different Ti³+ concentrations, which showed the importance of inhomogeneous broadening in such materials. An important component of this study was concerned with Cr³ doped glasses, where in addition to the general absorption and luminescence, the site selection spectroscopy and time resolved techniques were carried out. The ²E - 4A2 transition wasinvestigated using the fluorescence line narrowing (FLN) to understand the structural and dynamic properties of the homogeneously broadened transitions, which are normally obscured in glasses by the inhomogeneous broadening, the origin of which lie in the disorder nature of the glassy materials. The distorted symmetry of the high field sites was investigated using Zeeman spectroscopy coupled to the fluorescence line narrowing, where the Zeeman splittings of the ²E - 4A2 transitions were measured toreveal weak trigonal distortion of the predominantly octahedralsymmetry in these glasses.
Supervisor: Henderson, Brian Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral