Two kinds of germanate glasses singly doped with the ion concentration of 2.0mol.%Tm3＋ and 2.0mol.%Ho3＋, respectively, were prepared.According to McCumber theory, the absorption and stimulated emission cross-section...Two kinds of germanate glasses singly doped with the ion concentration of 2.0mol.%Tm3＋ and 2.0mol.%Ho3＋, respectively, were prepared.According to McCumber theory, the absorption and stimulated emission cross-sections corresponding to the 3H6←→3F4 transitions of Tm3＋（at 1.8 μm） and the 5I8←→5I7 transitions of Ho3＋（at 2.0 μm） were obtained, and respective gain cross-section spectra were also computed as a function of population inversion according to absorption and emission cross-sections and the ion concentrations.For Tm3＋-doped germanate glasses, the maximum of the absorption, emission, and gain cross-sections reached a value higher than those reported for fluorozirconate, fluoride, and oxyfluoride glasses.For Ho3＋-doped germanate glasses, the maximum of absorption, emission, and gain cross-sections reached a value higher than that reported for fluorozircoaluminate glasses.Hence, these Tm3＋-doped and Ho3＋-doped germanate glasses exhibited an advantage for application in mid-infrared lasers at about 1.8 and 2.0 μm wavelength.展开更多
Ho3＋ doped glasses with various compositions xGeO2-（80-x）TeO2-9.5ZnF2-1ONaF-O.5Ho203 （x=, 10, 20, 30, 40, 50, 60, 70 and 80） were prepared by a melt-quenching technique. The composition-dependent optical transiti...Ho3＋ doped glasses with various compositions xGeO2-（80-x）TeO2-9.5ZnF2-1ONaF-O.5Ho203 （x=, 10, 20, 30, 40, 50, 60, 70 and 80） were prepared by a melt-quenching technique. The composition-dependent optical transition properties of Ho3＋ were investigated in the framework of Judd-Ofelt theory. The emission cross sections for5I7→5I8 transition of 1-Io3＋ in these glasses were calculated according to McCumber theory, and their compositional dependence was discussed. A simple method was proposed in calculating the emission cross sections of 5I7→5I8 transition, and the calculation results were compared with those derived from McCumber theory. Finally, the optical gain coefficient spectra for 5I7→5I8 transition were also analyzed.展开更多
基金supported by the National Natural Science Foundation of China (Grant 60777030)the Open Foundation of the Key Laboratory of Ningbo City (2007A22010) K.C.Wong Magna Fund in Ningbo University
文摘Two kinds of germanate glasses singly doped with the ion concentration of 2.0mol.%Tm3＋ and 2.0mol.%Ho3＋, respectively, were prepared.According to McCumber theory, the absorption and stimulated emission cross-sections corresponding to the 3H6←→3F4 transitions of Tm3＋（at 1.8 μm） and the 5I8←→5I7 transitions of Ho3＋（at 2.0 μm） were obtained, and respective gain cross-section spectra were also computed as a function of population inversion according to absorption and emission cross-sections and the ion concentrations.For Tm3＋-doped germanate glasses, the maximum of the absorption, emission, and gain cross-sections reached a value higher than those reported for fluorozirconate, fluoride, and oxyfluoride glasses.For Ho3＋-doped germanate glasses, the maximum of absorption, emission, and gain cross-sections reached a value higher than that reported for fluorozircoaluminate glasses.Hence, these Tm3＋-doped and Ho3＋-doped germanate glasses exhibited an advantage for application in mid-infrared lasers at about 1.8 and 2.0 μm wavelength.
基金supported by National Natural Science Foundation of China (50972021 and 61078061)Natural Science Foundation of Liaoning Province(20092147)+1 种基金Foundation of Education Department of Liaoning Province (L2010056)Fundamental Research Funds for the Central Universities (117125)
文摘Ho3＋ doped glasses with various compositions xGeO2-（80-x）TeO2-9.5ZnF2-1ONaF-O.5Ho203 （x=, 10, 20, 30, 40, 50, 60, 70 and 80） were prepared by a melt-quenching technique. The composition-dependent optical transition properties of Ho3＋ were investigated in the framework of Judd-Ofelt theory. The emission cross sections for5I7→5I8 transition of 1-Io3＋ in these glasses were calculated according to McCumber theory, and their compositional dependence was discussed. A simple method was proposed in calculating the emission cross sections of 5I7→5I8 transition, and the calculation results were compared with those derived from McCumber theory. Finally, the optical gain coefficient spectra for 5I7→5I8 transition were also analyzed.
