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以K_2W_2O_7为助溶剂,在钨酸钆钾[KGd(WO_4)_2,KGW]晶体中分别掺入稀土元素离子Nd~(3+),Yb~(3+),Er~(3+)和Er~(3+)+Yb~(3+),用顶部籽晶提拉法分别生长出Nd∶KGW,Yb∶KGW,Er∶KGW和Er∶Yb∶KGW4种激光晶体。获得最佳的生长工艺参数是:转速为10~15r/min,拉速为1~2mm/d,降温速率为0.05~0.1℃/h,生长周期为10~15d。经X射线分析确定4种晶体均为β相。利用热重差热分析确定了晶体的熔点和相转变温度,结果表明:Nd∶KGW,Yb∶KGW,Er∶KGW和Er∶Yb∶KGW4种晶体的熔点分别为1085,1086,1080℃和1079℃;相转变温度分别为1023,1021,1021℃和1024℃。分析了晶体产生缺陷的原因。
The rare earth elements Nd ~ (3 +), Yb ~ (3 +), Er ~ (3+) and Er (superscript 2 +) were incorporated into the crystals of gadolinium tungstate [KGd (WO_4) _2, KGW] with K_2W_2O_7 as cosolvent. ~ (3 +) + Yb ~ (3+), four types of Nd: KGW, Yb: KGW, Er:KGW and Er:Yb:KGW laser crystals were respectively grown by the top seed pulling method. The optimum growth parameters were as follows: rotating speed 10 ~ 15r / min, pulling speed 1 ~ 2mm / d, cooling rate 0.05 ~ 0.1 ℃ / h and growth period 10 ~ 15d. X-ray analysis confirmed that the four kinds of crystals are β phase. The melting point and phase transition temperature of the crystals were determined by TG-DTA. The results showed that the melting points of the Nd: KGW, Yb: KGW, Er: KGW and Er:Yb:KGW4 crystals were 1085, 1086, 1080 ℃ and 1079 ℃; the phase transition temperatures were 1023, 1021, 1021 ℃ and 1024 ℃, respectively. The causes of crystal defects were analyzed.