Crystal growth, spectroscopic characteristics, and Judd-Ofelt analysis of Dy:Lu2O3 for yellow laser

Dy:Lu2O3 was grown by the float-zone (Fz) method. According to the absorption spectrum, the Judd–Ofelt (JO) parameters Ω 2, Ω 4, and Ω 6 were calculated to be 4.86 × 10−20 cm2, 2.02 × 10−20 cm2, and 1.76 × 10−20 cm2, respectively. The emission cross-section at 574 nm corresponding to the 4F9/2→6H13/2 transition was calculated to be 0.53 × 10−20 cm2. The yellow (4F9/2→6H13/2 transition) to blue (4F9/2→6H15/2 transition) intensity ratio ranges up to 12.9. The fluorescence lifetime of the 4F9/2 energy level was measured to be 112.1 μs. These results reveal that Dy:Lu2O3 is a promising material for use in yellow lasers.