Optical properties of transparent Li_2O-Ga_2O_3-SiO_2 glass-ceramics embedding Ni-doped nanocrystals

摘要

Transparent Li_2O-Ga_2O_3-SiO_2 (LGS) glass-ceramics embedding Ni:LiGa_5O_8 nanocrystals were fabricated. An intense emission centered around 1300 nm with the width of more than 300 nm was observed by 976 nm photoexcitation of the glass-ceramics. The lifetime was more than 900 μs at 5 K and 500 μs at 300 K. The emission could be attributed to the ~3T_(2g)(~3F)→~3A_(2g)(~3F) transition of Ni~(2+) in distorted octahedral sites in LiGa_5O_8. The product of stimulated emission cross section and lifetime for the emission was about 3.7 x 10~(-24) cm~2 s and was a sufficiently practical value.