Yb∶KGW激光晶体原料制备与单晶生长

Raw Material Synthesis and Single Crystal Growth of Yb∶KGW Laser Crystal

Yb∶KGW晶体在可调谐微片激光器中有重要的应用价值。本文研究了Yb∶KGW多晶粉料的合成温度及烧结时间 ,确定在 90 0℃经 1 2h烧结合成Yb∶KGW多晶粉料。通过对K2 WO4和K2 W2 O7两种助溶剂性能及生长温度曲线的对比分析 ,选择K2 W2 O7作助溶剂 ,设计合理的工艺参数 ,采用熔盐法生长了新型的稀土激光晶体Yb∶KGW。对晶体粉末进行XRD图谱测试 ,判定所生长的晶体为 β Yb∶KGW ,经TG DTA分析 ,确定其熔点为 1 0 86℃ ,相变温度为1 0 2 1℃。

The key factor for crystal growth of Yb:KGW laser crystal is the selection of the flux and the design of the proper processes. Comparing the phase diagram and temperature field between K2WO4 and K2W2O7, Yb: KGW crystal was grown by the flux method using K2W2O7 as a suitable flux. By analyzing the X-ray diffraction spectra of Yb:KGW crystal powder sample and KGW powder sample, we found the same distribution of the diffraction maximum and the relative intensity, so it is concluded that the β- Yb:KGW crystal is of low-temperature phase, monoclinic system and C2/c space group. On the basis of TG-DTA, the results show that Yb:KGW has two obvious absorption peaks at 1086°C and 1021°C contrasting with the pure KGW crystal (melting point at 1031°C, phase transition temperature from tetragonal system to monoclinic system is 1088°C).The Yb:KGW crystal's melting point is about 1086°C and the phase transition peak from tetragonal system to monoclinic is at 1021°C.