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 Ω₂, Ω₄, and Ω₆ 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 ⁴F_9/2→⁶H_13/2 transition was calculated to be 0.53×10^-20 cm². The yellow (⁴F_9/2→⁶H_13/2 transition) to blue (⁴F_9/2→⁶H_15/2 transition) intensity ratio ranges up to 12.9. The fluorescence lifetime of the ⁴F_9/2 energy level was measured to be 112.1 μs. These results reveal that Dy:Lu₂O₃ is a promising material for use in yellow lasers.