KTb3F10单晶生长及光谱性能研究OA

KTb3F10(KTF)crystal,characterized by its high Tb3+ion concentration,low thermo-optic coefficient and low phonon energy,exhibits significant potential for efficient laser emission in the green and yellow wavelength ranges.However,challenges such as incongruent melting behavior,hygroscopicity of raw materials,high-temperature compositional volatility,and corrosive nature of fluorides have severely hindered the growth of high-quality KTF crystals.This study aims to develop an effective approach to address these issues,achieve the growth of high-quality KTF crystals,and characterize their optical properties.An optimized vertical Bridgman method integrated with a laser-sealed platinum crucible technique under vacuum was employed.This innovative approach effectively shielded the raw materials from water and oxygen contamination while suppressing compositional deviation during crystal growth through a sealed environment.As a result,blank KTF crystals with dimensions of ϕ16 mm×30 mm were successfully grown,and their relevant spectral properties were characterized.X-ray rocking curve of the(111)plane showed a full width at half maximum of 0.08°,indicating high crystalline perfection.Thermal analysis indicated significant volatilization of KTF at high temperatures.Spectral tests revealed an average transmittance of>90%in the 400-1600 nm range and an absorption coefficient of<0.007 cm-1 at 1064 nm,demonstrating minimal optical loss suitable for high-power laser applications.Fluorescence lifetime was 4.82-4.99 ms for the Tb3+ion at the 5D4 energy level,which is 3-5 times longer than that in oxide matrices.This superiority is attributed to the suppression of non-radiative relaxation by the low-phonon fluoride matrix,enhancing the energy storage efficiency for laser emission.Based on above data,this study has successfully established a viable growth method for KTF crystals,providing a new technical pathway for the controllable synthesis of KTF and other ternary fluoride materials.All these results provide valuable insights for the high-efficiency application of KTF crystals in yellow-green laser emission.