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In this paper, the Floating zone technique was used to grow high-quality Cr3+:YScO 3 crystals. The absorption cross-sections of the 4A 2 →4T 1 transition and 4A 2 →4T 2 transitions were calculated to be 1.71 × 10−20 cm2 at 488 nm and 0.72 × 10−20 cm2 at 666 nm, respectively. The crystal field strength Dq, Racah parameters B, and C were calculated to be 1502 cm−1, 533 cm−1, and 3362 cm−1, respectively. In the Cr3+:YScO 3 crystal, the effective phonon energy and Huang-Rhys factor S were calculated to be 284 cm−1 and 8.62, respectively. The emission cross-section at 988 nm corresponding to the 4T 2 →4A 2 transition was calculated to be 1.44 × 10−20 cm2 with full width at half maximum (FWHM) of 318 nm. All the results show that Cr3+:YScO 3 crystal has the potential to be a tunable and ultrafast laser crystal. • Cr:YScO 3 crystals were successfully grown by the Floating zone technique(FZ) method. • Broad emission spectrum with full width at half maximum (FWHM) of 318 nm in Cr:YScO 3 crystals was observed. • Spectral properties and crystal field parameters of Cr:YScO 3 crystals were investigated and analysed. [ABSTRACT FROM AUTHOR]

Ho3+-doped CaYAlO 4 (Ho:CALYO) crystal fibers have been successfully grown from the melt by the micro-pulling-down (μ -PD) technique for the first time. The polarized absorption spectra, fluorescence spectra and lifetime decay curves were measured at room temperature. The most intense emission of 2 at.% Ho:CALYO crystal fiber appears at 2072 nm with the full width at half maximum (FWHM) of 181.1 nm for σ polarization and at 2022 nm with FWHM of 199.4 nm for π polarization, respectively. The decay lifetimes of 5I 7 state of Ho:CALYO crystal fibers with different holmium concentration were calculated. All the results show that Ho:CALYO crystal fiber has potential as a laser gain medium for ultrashort and tunable Mid-infrared laser system. • Ho:CaYAlO 4 shaped crystal fibers with different Ho3+ concentration were grown using by the micro-pulling-down method. • The effect of Ho3+ concentration on the spectroscopic properties of Ho:CaYAlO 4 crystal fibers was studied. • Ho:CaYAlO 4 crystal fibers have large FWHMs of fluorescence spectra, which is better for tunable and short pulse laser output. [ABSTRACT FROM AUTHOR]