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The crystal growth, polarized spectral properties, Judd-Ofelt (JO) analysis and lifetime of Sm:CaGdAlO 4 (Sm:CGA) crystal were reported for the first time. Sm:CGA crystal with size of Φ4 × 33 mm 3 was grown by the floating zone (FZ) method. The peak absorption cross-sections at 407 nm were calculated to be 3.41 × 10 −20 cm 2 and 3.20 × 10 −20 cm 2 for the σ and π polarization, and the largest stimulated emission cross-sections at 601 nm were 5.10 × 10 −21 cm 2 and 4.66 × 10 −21 cm 2 , respectively. The absorption and emission cross-sections were several times larger than that of Sm:LiYF 4 . The JO intensity parameters of Ω 2 , Ω 4 and Ω 6 were calculated to be 3.0 × 10 −20 cm 2 , 6.1 × 10 −20 cm 2 and 6.5 × 10 −20 cm 2 , respectively. The lifetime of the 4 G 5/2 level was obtained to be 0.69 ms. All the results indicate that Sm:CGA crystal is a potential laser host for the reddish-orange laser operation. [ABSTRACT FROM AUTHOR]

The crystal growth, optical spectra and lifetime of Dy:CaGdAlO 4 crystal were investigated for the first time to our best knowledge. Single Dy:CaGdAlO 4 crystal with size of Φ4 × 40 mm 3 was grown by floating zone method. The peak absorption cross-sections were calculated to be 2.43 × 10 −21 cm 2 and 1.28 × 10 −21 cm 2 at 453 nm for σ and π polarizations. The Judd-Ofelt (JO) parameters of Ω 2 , Ω 4 and Ω 6 were calculated to be 1.8 × 10 −20 cm 2 , 1.0 × 10 −20 cm 2 and 0.5 × 10 −20 cm 2 , respectively. The emission cross-sections were calculated to be 0.51 × 10 −20 cm 2 and 0.55 × 10 −20 cm 2 for σ and π polarizations. The fluorescence decay time is 222 μs. The results indicate that the Dy:CaGdAlO 4 crystal is a potential candidate for yellow laser operation. [ABSTRACT FROM AUTHOR]