Polarized spectral properties of Sm:YAlO3 single crystal for reddish-orange laser

Abstract

Sm:YAlO3 (Sm:YAP) crystal with size of Φ28 × 80 mm3 was grown by Czochralski (Cz) method. Polarized absorption spectra and fluorescence spectra of Sm:YAP crystal were discussed for the first time. The peak emission cross-sections were calculated to be 0.80 × 10−21 cm2 (604 nm for a-polarization), 1.82 × 10−21 cm2 (604 nm for b-polarization) and 1.63 × 10−21 cm2 (610 nm for c-polarization), respectively. The Judd-Ofelt (JO) intensity parameters were calculated to be Ω2 = 2.59 × 10−20 cm2, Ω4 = 1.78 × 10−20 cm2 and Ω6 = 2.98 × 10−20 cm2, respectively. The decay lifetime of 4G5/2 energy level was measured to be 2.51 ms. All above results indicate the Sm:YAP crystal may be a potential candidate of reddish-orange laser pumped directly by the GaN/InGaN laser diode.