Dy:Y2SiO5和Dy,Tb:Y2SiO5单晶生长与黄光发射光谱性能OA

Yellow laser sources in the range of 570-590 nm have many important applications in frontier fields such as flow cytometry,sodium guide star,and ophthalmic surgery.Yellow laser output from blue laser diode-pumped Dy3+-doped crystals is a promising technology with advantages of high efficiency,compactness,and high power stability.However,Dy3+-doped laser crystals mainly focused on low-phonon-energy fluorides,while the high-phonon-energy oxides were rarely studied.Herein,high-quality Dy3+-doped and Dy3+,Tb3+co-doped Y2SiO5(YSO)crystals were grown by the optical floating zone method.The yellow emission and energy transfer processes in Dy:YSO and Dy,Tb:YSO crystals were investigated.Compared with Dy:YSO,the absorption cross-section of Dy,Tb:YSO at 450 nm increases from 1.75×10-21 cm2 to 2.21×10-21 cm2,and the yellow emission cross-section at 574 nm increases from 3.45×10-21 cm2 to 4.32×10-21 cm2.In addition,the co-doped Tb3+ions act as deactivator ions and the energy transfer efficiency from 6H13/2 level of Dy3+to 7F4 level of Tb3+is 50.7%.As a result,the lifetime of Dy3+lower level is greatly shortened to 202.9 µs,which is favorable for population inversion and yellow laser output.These results indicate that Dy,Tb:YSO crystal is a promising yellow laser gain medium.