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A new promising mixed laser crystal of the composition Yb:Y0.79Lu0.21VO4 was grown and realized, achieving a continuous-wave laser output.

The Er3+/Yb3+ co-doped phosphate glasses with GeO2 modification (PGs) were successfully prepared by melt-quenching method. Their physical parameters were investigated such as density, refractive index, glass transition temperature and coefficients of thermal expansion. The phenomenological intensity parameters Ω t (t = 2, 4, 6) of the PGs have been calculated by the Judd-Ofelt theory. The relationship between optical properties and GeO2 concentration was discussed in this work. The laser experiment using PG10 (GeO2 10 mol% modified phosphate glass with Er3+/Yb3+ ratio of 0.5/2) was carried out. The research results indicate that the introduction of GeO2 results in a large absorption and emission cross-section, a long lifetime, a high quantum efficiency, and an excellent laser performance. All these advantages could also portend an optimized method for improving spectroscopic properties in other constituent Er3+/Yb3+ co-doped phosphate glass by introducing GeO2.

Dy3+/Tb3+ co-doped antimony phosphate glasses (PDTs) were prepared by a common melt-quenching method. The spectra properties of PDTs were analyzed in the range of 300 to 850 nm. The sensitization mechanism of Dy3+ in enhancing the visible fluorescence of Tb3+ ions was explored. Since the energy of Dy3+ ions are effectively transferred to Tb3+ ions, an enhancement of Tb3+ emission at 545 nm and a reduction of Dy3+ emission at 575 nm were observed. The energy transfer (ET) between Dy3+ and Tb3+ ions result from the electric dipole interaction. In the PD1T4 sample pumped at 450 nm, a maximum ET efficiency of 63.1% was obtained. The larger values of laser characteristic parameters of Tb3+: 5D4 → 7F5 transition indicate that these antimony phosphate glasses have great potential for green lasing operation.