Yb3+掺杂KY(WO4)2激光晶体生长、结构与光谱分析

采用顶部籽晶提拉法(TSSG)生长出Yb:KY(WO₄)₂(Yb:KYW)激光晶体.对预烧后的原料及晶体进行了XRD分析，结果表明，分别在920℃和600℃预烧8h后的熔质和助熔剂基本上形成一相，抑止了实验中的挥发问题；所生长的晶体为β-Yb:KYW，计算其晶格常数为a=1.063nm，b=1.034nm，c=0.755nm，β=130.75°.测得不同厚度样品的吸收光谱，结果表明样品在933nm和981nm有较强的吸收峰，计算出主峰981nm的吸收截面σ关键词： Yb:KYW TSSG法 晶体结构 光谱参数

Growth, structure and spectral properties of Yb3+-doped KY(WO4)2 laser crystal

Yb³⁺-doped KY(WO₄)₂ (Yb:KYW) laser crystal was grown by top seeded solution growth (TSSG) method. The solute and solvent calcined at 920℃ and 600℃ respectively for 8h formed a single phase as shown by XRD analysis, which suppressed the volatilization in the growth process. The as-grown crystal was identified as β-Yb:KYW by XRD, and the cell parameters of Yb:KYW were calculated to be a=1.063nm, b=1.034nm, c=0.755nm and β=130.75°. Absorption spectrum of samples with different thickness (E//c) were obtained, in which two intensive peaks at 933nm and 981nm were observed, and the absorption cross section is 5.34×10^-20cm² at the main peak of 981nm. Fluorescence spectrum of the sample was measured and there exist three intensive emission peaks at 990, 1010 and 1030nm. It was calculated that the peak emission cross section is 3.1×10^-20cm² at 1030nm and the lifetime is 0.56ms which is closed to the measured value. The pumping parameter (β), saturated pump intensity (I_sat) and minimum pump intensity (I_min) were calculated, and the parameter I_min (24kW/cm²) of Yb:KYW is very low compared to other Yb³⁺ doped crystals.