Yb:YAG的晶体生长和光谱参数计算

用提拉法生长了质量优良的大尺寸Yb :YAG晶体 ,在室温下测量了它的 2 0 0～ 30 0 0nm的吸收光谱。在 2 0 0～ 390nm范围内 ,晶体的吸收来自基质YAG ;在 390～ 30 0 0nm范围内 ,仅有Yb3 + 的特征吸收。Judd Ofelt理论计算的结果表明 ,(2 4at% )Yb :YAG的电偶极子的吸收、发射振子强度分别为 3 5 8× 10 -6,4 77× 10 -6,吸收、发射跃迁几率分别为每秒 879,1171。磁偶极子的吸收、发射振子强度分别为 3 32×10 -7,4 4 3× 10 -7,吸收、发射跃迁几率分别为每秒 82 ,10 9;2 F5/ 2 能级寿命为 781μs。

Crystal Growth and Spectral Parameter Computation of Yb:YAG

In this article, a good-quality crystal Yb:YAG was grown by pull method, and its absorption spectrum of 200-3000 nm was measured at room temperature. Its absorption of 200-300 nm is from the host YAG, and there exists only the characteristic absorption of Yb3+ in the range of 390-3000 nm. Judd-Ofelt theory computation indicates that the absorption and emission oscillator strengths of electric dipole of (24 at%) Yb:YAG are 3.58 x 10(-6) and 4.77 x 10(-6), respectively, and the absorption and emission transition probabilities are 879 and 1171/s respectively. As for magnetic dipole, the absorption and emission oscillator strengths are 3.32 x 10(-7) and 4.43 x 10(-7) respectively, and the absorption and emission transition probabilities are 82 and 109/s respectively. The lifetime of the energy level2 F(5/2) is 781 micros.