Abstract A Dy3+:Na2La4(WO4)7 crystal was grown successfully by the Czochraski method, its spectroscopic properties were investigated in detail. The radiative transition probabilities, fluorescence branching ratios, and radiative lifetime of Dy3+ ions were obtained based on the Judd-Ofelt theory. The absorption cross sections at 454 nm are 1.1 × 10−21 cm2 and 0.75 × 10−21 cm2 for σ-polarization and π-polarization, respectively. The stimulated emission cross sections at 574 nm is 1.64 × 10−20 cm2 for π-polarization, and 1.79 × 10−20 cm2 for σ-polarization. The fluorescence lifetime of the 4F9/2 energy level is 218 µs. The results show that Dy3+:Na2La4(WO4)7 crystal is very suitable for commercial 450 nm blue laser diodes pumping, and is a promising yellow laser material.

中文翻译：

---

Dy3+:Na2La4(WO4)7 的晶体生长和光谱表征 - 一种潜在的黄色激光材料

摘要 采用Czochraski 法成功生长了Dy3+:Na2La4(WO4)7 晶体，并对其光谱性质进行了详细研究。Dy3+ 离子的辐射跃迁概率、荧光分支比和辐射寿命是基于 Judd-Ofelt 理论获得的。对于 σ 偏振和 π 偏振，454 nm 处的吸收截面分别为 1.1 × 10−21 cm2 和 0.75 × 10−21 cm2。574 nm 处的受激发射截面对于 π 偏振为 1.64 × 10−20 cm2，对于 σ 偏振为 1.79 × 10−20 cm2。4F9/2 能级的荧光寿命为 218 µs。结果表明，Dy3+:Na2La4(WO4)7晶体非常适合商用450 nm蓝色激光二极管泵浦，是一种很有发展前景的黄色激光材料。