Investigation Of ³μm Emission Performance Of Er³⁺ Doped Oxyfluoride Glasses

Domestic and foreign institutions have conducted investigations on mid-infrared laser, due to its applications in military weapons, environmental pollution detectors and medical surgeries. The ZBLAN fluoride glass which shows outstanding ~3μm emission properties has been developed into commercial mid-infrared laser products. However, the shortcoming of inferior chemical stability as well as the rigorous preparation requirement prevents the ZBLAN glass from further industrialization. Oxyfluoride glass which is generated by adding oxide into fluoride glass has been proved to be a good candidate for ~3μm laser since it combines both advantages of oxide glass and fluoride glass. Moreover, oxyfluoride has a wide component range of glass formation and the properties of oxyfluoride are adjustable. Therefore, in this dissertation, we have conducted a series of experimentations with different types and amounts of oxides(which are adding into fluoride glasses) to looking for a good host material for ~3μm laser.The dissertation has three major chapters:1. Fluorophosphate glass. The effects of phosphate on the physical properties, structure and luminescent properties in fluorophosphate glass have been investigated in this part. The results indicate that the Er3+-doped fluorophosphate glass is a good material host for 1.53μm EDFA.2. Fluorotellurite glass with low contents of Te O2(≤20mol%). The effects of Te O2 on the physical properties, structure and luminescent properties in fluorotellurite glass have been investigated in this part. A king of good material host for ~3μm laser is obtained with the parameter of σem×Δλeff=691.71×10-28cm3. Meanwhile, the luminescent properties and energy transfer route of Er3+/Tm3+ co-doped fluorotellurite glass are studied. By using F?ster-Dexter theory, the energy transfer efficiency CDA of Er3+: 4I13/2 to Tm: 3F4 is 4.94×10-40cm6/s, larger than the CDA of Er3+: 4I11/2 to Tm: 3F5.3. Oxyfluoride tellurite glass with high contents of Te O2(>50mol%). The effects of Te O2 on the physical properties, structure and luminescent properties in oxyfluoride tellurite glass have been investigated in this part. The concentration quenching happens slightly when the Er3+ concentration reaches up to 9mol%. And the oxyfluoride tellurite glass has promising ~3μm luminescent properties with the parameter of σem×Δλeff=835.22×10-28cm3. To explain the concentration dependence of ~3μm luminescent intensity under 808 nm excitation, the rate equations have been established. By fitting the lifetime decay curves of 4I13/2 level and 4I11/2 level respectively, the up-conversion transfer efficiency WETU of 4I13/2 level and 4I11/2 level are calculated. The results demonstrate that with increment of Er3+ concentration, the up-conversion transfer efficiency of 4I13/2 level increases while the up-conversion transfer efficiency of 4I11/2 level keeps down, therefore, the ~3μm luminescent intensity increases. Moreover, the luminescent properties and energy transfer route Er3+/Pr3+ co-doped oxyfluoride tellurite glass are studied. The best doping ratio has been proved to be 2:1.