Crystal growth and optical features study of Dy:Sr3Gd(BO3)3 crystal for yellow laser

Abstract

The Dy3+:SGB single crystal has been successfully prepared for the first time via the Czochralski technique, of which the optical features were investigated in detail. Based on measured polarized absorption spectra, various spectral parameters were determined via Judd-Ofelt theory. The peak absorption cross-sections at 450 nm for the 6H15/2 → 4I15/2 transition of Dy3+ ions, are 0.66 × 10−21 cm2 for π-polarization and 0.59 × 10−21 cm2 for σ-polarization respectively. The emission cross-sections at 576 nm are 1.91 × 10−21 cm2 and 1.67 × 10−21 cm2 for π and σ polarizations accordingly. Radiative and fluorescence decay times of Dy3+: 4F9/2 level were measured to be 1.607 ms and 1.037 ms, respectively, and the quantum efficiency is 64.5%. All experimental results tell that Dy:SGB could be a potential candidate for direct LD-pumped yellow lasers.