1997 年 61 巻 11 号 p. 1175-1180
Absorption spectra of Cu+ and Cu2+ were measured for silicate, borate, and phosphate glasses doped with 0.1 mol%Cu2O. The molar extinction coefficient at the peak wavelength of the 2B1g→2B2g transition of Cu2+ was used as a parameter showing the relative content of Cu+ ions in glass samples. Compositional dependence of Cu+-Cu2+ redox was examined using compositional parameter B which represented the average basicity of glasses. We estimated that glass composition within the B range of 0.2-0.3 is suited for Cu+-doped tunable glass laser because the absorption of Cu2+ was minimized at this range. In borate and phosphate glasses, the Cu+ ion was chemically stabilized by the addition of alumina. We concluded that the glass composition suitable for Cu+-doped tunable glass laser materials is 10Na2O·80B2O3·10Al2O3 on the basis of fluorescence measurement.