Spectrum Characteritics of K~+;;Yb~(3+);;BaWO_4 Crystals

To increase concentration of yb~(3+)-ions in BaWO_4 crystals,co-doped K~+-ions method were adopted.Absorption coefficient of K~+(x(K+~)=0.01),Yb~(3+)(x(Yb~(3+))=0.02):BaWO~4 crystals isα= 0.494 cm~(-1) at 977 nm.Fluorescence spectra of Yb~(3+)-ions from 960 nm to 1 020 nm,corresponding to transition ~2F_(5/2)→~2F_(7/2) was investigated.Emission cross section at 1 005 nm is 6.286×10~(-20)cm~2,livetime is 0.4 ms.The experimental result shows that K~+,Yb~(3+):BaWO_4 is a potential laser crystal.