The spectroscopic properties of Er3+-doped lead oxyfluorosilicate glasses were analyzed with Judd-Ofelt and McCumber theories. The obtained data suggest that the fluorescence full width at half maximum (FWHM) is related to the X6 parameter, the larger the X6 parameter, and the broader the FWHM. The results showed that Er3+-doped 45SiO2-5Bi2O3-50PbF2 glass had the broadest FWHM (64nm) and large stimulated emission cross-section (0.73×10-20cm2) in these glass samples. Compared with other glass hosts, the gain bandwidth properties of Er3+-doped 45SiO2-5Bi2O3-50PbF2 glass is close to those of tellurite and bismuth glasses, and has advantage over those of silicate, phosphate and germante glasses. The results suggest that Er3+-doped 45SiO2-5Bi2O3-50PbF2 glass can be used as potential host material for developing broadband optical amplifiers in wavelength-division-multiplexingnetwork system.

研究了Yb3+/Er3+共掺锗碲酸盐玻璃在980nmLD抽运下的上转换发光光谱，发现随着碱金属离子半径的增大，上转换发光强度明显增强。基质玻璃的Raman光谱显示：玻璃的最大声子能量并不随碱金属氧化物之间的取代而发生变化，表明最大声子能量并不是锗碲玻璃上转换发光强度增大的原因。从玻璃无辐射跃迁的角度分析表明：最大能量声子密度的降低是影响Yb3+/Er3+共掺锗碲玻璃上转换发光强度增大的主要原因。

Yb31/Er31-codoped Na2O-Al2O3-GeO2-PbO-PbF2 glasses that are suitable for use in fiber lasers, amplifiers, and waveguide devices have been fabricated and characterized. The density, refractive indices, optical absorptions, Judd-Ofelt parameters, and spontaneous-transition probabilities of the glasses have been measured and calculated. Intense and broad 1.53-mm infrared fluorescence and visible upconversion luminescence were observed under 976-nm diode laser excitation. For the 1.53-mm emission band, the full widths at the halfmaximum increase and the peak wavelengths are blueshifted with an increase of PbF2. The stimulatedemission cross sections were calculated from the measured-absorption cross section according to the McCumber theory. The monotonically reduced emission cross section arises from the decreased refractive indices of glasses and the increased linewidth of the infrared fluorescence spectrum. For the upconversion emissions centered at 524, 547, and 660nm, the emission intensity changes remarkably with PbF2 contents from 0 to 15mol%. The quadratic dependence of the green and red emissions on excitation power indicates that a twophoton absorption process occurs under the 976-nm excitation. The relatively long lifetimes of the Er31 4S3/2 and 4F9/2 levels for the NAGF3 glass gives rise to a much more intense upconversion emission.

We report the ultraviolet laser-induced absorption spectra and refractive index changes in bismuth-based silicate glass. A positive maximum refractive index change of 6×10−4 has been observed in bismuth-based silicate glass upon exposure to a pulsed 248nm KrF excimer laser. It is also seen that the changes in the absorbance and refractive index are strongly dependent on glass melting onditions.