Analysis of the Spectroscopic Parameters of Chalcogenide Glasses in the Ga-Ge-S :Er~(3+) System

摘要

The spectroscopic characteristics of chalcogenide glasses in the Ga-Ge-S :Er~(3+) system are determined.The oscillator strengths,the Judd-Ofelt intensity parameters,the probabilities of spontaneous radiative transitions,and the radiative lifetimes of levels are calculated from the absorption spectroscopy data for two series of Ga-Ge-S chalcogenide glasses doped with Er~(3+) ions.In the first series,the Er_2S_3 content is varied from 0.49 to 4.64 mol % at the fixed composition of the glass matrix (0.15Ga_2S_3 centre dot 0.85GeS_2).In the second series,the Ga_2S_3 content is varied from 10 to 30 mol % at the fixed Er_2S_3 content (1.94 mol %).The aforementioned spectroscopic parameters are analyzed as a function of the chalcogenide glass composition.It is revealed that the values of the oscillator strengths and the probabilities of spontaneous radiative transitions in Er~(3+) ions in the chalcogenide matrix are larger than those in phosphate,germanate,and tellurite matrices.