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Title: Spectroscopy, modeling and investigation of thulium doped tellurite glass
Author: Taher, Masaud Abdusalam
Awarding Body: Swansea University
Current Institution: Swansea University
Date of Award: 2011
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A thulium (Tm[3+]) doped tellurite glass with a composition 75TeO2-20ZnO-5Na2O (mol %) has been investigated. Two attractive emission transitions at 1470 nm and 1810nm were absorbed and the radiative lifetimes are 0.37 ms and 2.64 ms respectively. The 1470 nm fluorescence is broad with a full width at half maximum of 105 nm. The emission spectra achieved under 785 nm excitation reveal the existence of energy transfer via cross relaxation Tm[3+]. As a result, the intensity of the 1470 nm transition band decreases in relation to that of emission at 1810 nm, as thulium concentration increases. Anew technique was applied to calculate cross relaxation [3]H[4], [3]H[6] → [3]H[4], [3]H[4] utilizing emission spectra has been proposed. Obtained values of cross relaxation showed linear dependence with dopant concentration and good agreement with the cross relaxation parameter extracted from lifetime measurements. Thulium energy level rate equations involving pumping rate, cross relaxation parameter and lifetimes for both levels 3H4 and 3H4 have been solved and the results compared with the expel data. Excellent agreement is found between simulated and experimental data, which indicates the validity of the approach.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available