Laser Crystal Growth And Defects Study Of The Rare Earth Doped KLa(WO₄)₂

Recently, the Ytterbium doped potassium lanthanum tungstate crystal [Yb:KLa(WO₄)₂, abbreviated Yb:KLW] and Holmium, Ytterbium co-doped potassium lanthanum tungstate crystal [Ho:Yb:KLa(WO₄)₂, abbreviated Ho:Yb:KLW] are two kinds of new solid laser materials.In this paper, Yb:KLW and Ho:Yb:KLW crystals were grown by Top Seeded Solvent Growth(TSSG) method, using K₂W₂O₇ as flux. The infrared spectrum and Raman spectrum of these crystals were measured, the peak values were assigned. The XRD curve of these crystals were measured, the lattice parameters of Yb:KLW crystal a=b=0.532nm,c=1.189nm were obtained, and the lattice parameters of Ho:Yb:KLW were a=b=0.538nm,c=1.193nm. By analyzing on TG-DTA, the melting point of the Yb: KLW crystal and Ho:Yb: KLW crystal are 1119℃and 1118℃, separately, there is no phase transition below the melting point and the thermal stability is better. The absorption spectrum and fluorescence spectrum of crystals were tested, the corresponding spectral parameters were calculated. The results showed: The peaks of Yb:KLW crystal at 931nm, 981nm were found stronger and broader from the absorption spectrum and the emitting wavelength were at 1021nm, and the peaks of Ho:Yb:KLW crystal at 978nm were found stonger and broader from the absorption spectrum, both of them were propitious to InGaAs semiconductor laser pump.