Research On Composition, Structure And Properties Of Basic Glasses For 1.3μm Rare Earth Doped Optic Fiber Amplifier

Chalcohalide glasses are very promising candidate for 1.3 μm rare earth doped optical fiber amplifier. The interest in these materials stems principally from their low phonon energy, high refractive index and good chemical durability.In this thesis, analysis has been made about the relationships of composition, structure and properties within two pseudoternary systems: GeS₂-Ga₂S₃-NaCl and GeS₂-In₂S₃-NaCl and the impacts on the structure and properties of the materials by doping with Pr ³⁺ and Dy³⁺ rare earth ions. They were fabricated by the conventional melt-quenching technique, and characterized by X-ray diffraction (XRD), differential scanning calorimetry- thermogravimetry (DSC), visible-IR transmission and Raman spectroscopy.The results show that the glass-forming regions within pseudoternary systems: GeS₂-Ga₂S₃-NaCl and GeS₂-In₂S₃-NaCl were determined.Originating from the research of comprehensive thermal properties about the two pseudo-ternary systems, the compositions having the best glass-forming abilities were found out: 0.7GeS₂-0.2Ga₂S₃-0.1NaCl and 0.7GeS₂-0.15In₂S₃-0.15NaCl.Ascriptions and evolutions of Raman spectra within GeS₂-Ga₂S₃-NaCl systems were made reasonably in terms of micro-structural variation originating from the introduction of NaCl and its effect on mixed tetrahedral GaS_4-xCl_x.Raman spectra of samples within GeS₂-In₂S₃-NaCl system were reported. Furthermore, assignments and shifts of spectra on every component serial had been elucidated reasonably according to micro-structural transformation resulting from the conceivable formation of tetrahedral [InS_4/2], octahedral [InS₆] and ethane-like [S₃In-InS₃] and changes made to the tetrahedral InS_4-xCl_x.The glasses containing rare earth ions were fabricated, with the principle of the basic glasses having the best glass-forming abilities doped with PrCl₃ and DyCl₃. The thermal properties and emission attributions were researched.