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以K2W2O7为助熔剂,采用泡生法生长出了Pr3+掺杂量为5%(摩尔分数)的KYb(WO4)2(Pr:KYbW)自激活激光晶体。X射线衍射分析表明:生长的晶体为单斜晶系的Pr:KYbW,晶格常数为a=1.065 nm、b=1.031 nm、c=0.753 nm、β=130.65°。由样品的Raman光谱和红外光谱确认Pr:KYbW晶体内共有WO6和YbO8两种畸变多面体结构,验证了晶体中钨氧桥键的存在。吸收光谱表明:在945、975nm处出现了2个最强的吸收峰,对应于Yb3+的2F7/2→2F5/2能级跃迁。晶体的上转换荧光谱表明:在481nm处的蓝光来自于Pr3+的3P0→3H4能级跃迁;在645nm处的红光来自于Pr3+的3P0→3F2能级跃迁。
Using K2W2O7 as flux, KYb (WO4) 2 (Pr: KYbW) self-activating laser crystal with Pr3 + doping amount of 5% (molar fraction) was grown by bubble generation method. X-ray diffraction analysis showed that the grown crystal was monoclinic Pr: KYbW with lattice constants of a = 1.065 nm, b = 1.031 nm, c = 0.753 nm and β = 130.65 °. From the Raman spectra and infrared spectra of the samples, it was confirmed that there are two kinds of distorted polyhedron structures of WO6 and YbO8 in the Pr: KYbW crystal, which verifies the existence of the W-O bond in the crystal. The absorption spectra show that there are 2 strongest absorption peaks at 945 and 975 nm, corresponding to 2F7 / 2 → 2F5 / 2 transitions of Yb3 +. The up-conversion fluorescence spectra of the crystals show that the blue light at 481 nm comes from the 3P0 → 3H4 energy level transition of Pr3 + and the red light at 645 nm comes from the 3P0 → 3F2 energy level transition of Pr3 +.