Nd3+掺杂的氧化镧钇透明激光陶瓷的光谱性能研究

采用传统无压烧结工艺制备了Nd³⁺掺杂的Y_2-2xLa_2xO₃(x=0.08)透明陶瓷并对其光谱性能进行了研究. 结果表明：Nd³⁺:Y_1.84La_0.16O₃透明陶瓷在780—850 nm的波长范围内有较宽的吸收带. 当Nd³⁺掺杂量为1.5at%时，在820 nm和激光二极管抽运的808 nm处的吸收截面分别为σ_abs(820 nm)=1.81×10^-20 cm²，σ_abs(808 nm)=1.54×10^-20 cm². 最强的发射峰位于1078 nm处，并具有荧光寿命长、发射带宽宽、量子效率高等特点. 加入La₂O₃后，基质的光谱品质参数X_Nd由1.6减小到0.46，因此和⁴F_3/2—⁴I_11/2跃迁相对应的荧光分支比β_J,11/2增大为56.82%. Nd³⁺:Y_1.84La_0.16O₃透明陶瓷的这些性质有利于高效率的激光输出和超短锁模激光脉冲的实现. 关键词：氧化镧钇透明陶瓷光谱性能3+')" href="#">Nd³⁺

Spectroscopic characteristics of Nd3+-doped yttrium lanthanum oxide trans parent ceramics

Nd³⁺-doped Y_2-2x La_2x O₃ (x=0.08) transparent ceramics were fabricated by conventional fabrication process. Spectroscopic properties of the samples were investigated. The absorption band of Nd³⁺: Y_1.84La_0.16O₃ was broad covering the wavelength range 780—850 nm. When doped with 1.5at% Nd³⁺, the cross sections of the sample at 820 nm and laser diode pumped 808 nm were 1.81×10^-20cm² and 1.54×10^-20cm², respectively. The strongest emission peak of the sample was centered at 1078 nm with long fluorescent lifetime, broad emission bandwidth and high quantum efficiency. Because of the additive La₂O₃, the spectroscopic quality parameter (X_Nd) of matrix was decreased from 1.6 to 0.46, thus the fluorescence branch ratio of ⁴F_3/2—⁴I_11/2 transition was increased to 56.82%. These properties of Nd³⁺: Y_1.84La_0.16O₃ transparent ceramic are benefitial to achieve high efficient laser output and ultrashort modelocked pulse.