Search

High-quality Dy:PbWO 4 crystal has been successfully grown by the Bridgman method. Fluorescence properties of the grown crystal at the yellow-light region were discussed. The absorption cross-section of Dy3+ ions at 454 nm was calculated to be 0.142 × 10−20 cm2, which corresponded to the transition from 6H 15/2 to 4I 15/2 level. Based on Judd-Ofelt theory, the J-O intensity parameters Ω t and the emission cross-section were calculated. The fluorescence lifetime of 4F 9/2 level was measured to be 193 μs. • Dy: PbWO 4 crystal was grown successfully by the Bridgman method. • Judd-Ofelt theory was used to analyze the spectral properties of Dy: PbWO 4 for the first time. • Dy: PbWO 4 crystal is a potential laser medium for yellow laser operation. [ABSTRACT FROM AUTHOR]

The high optical quality Er:Lu 2 O 3 and Er,Pr:Lu 2 O 3 crystals were grown by Floating zone method. The spectral properties of Er:Lu 2 O 3 and Er,Pr:Lu 2 O 3 crystals were investigated. After co-doping small concentration of Pr3+, the depopulated influence of Pr3+ to the NIR emission was much stronger than the MIR emission. The near-infrared and up-conversion fluorescence were significantly quenched. Moreover, the fluorescence lifetime of 4I 13/2 abviously decreases from 4.02 ms to 1.71 ms in 7% Er, 0.05% Pr: Lu 2 O 3 crystal, and the lifetime ratio is 1.63 with large fluorescence lifetime of 4I 11/2 which is desirable lifetime ratio in these crystals. Thus, the spectral performance was significantly improved by co-doping 0.05 at.% of Pr3+. The high laser performance at 2.7 μm of 7% Er, 0.05% Pr: Lu 2 O 3 crystal is expectable. • The high optical quality Er:Lu 2 O 3 and Er,Pr:Lu 2 O 3 crystals were firstly grown by Floating zone method. • The spectral properties of Er:Lu 2 O 3 and Er,Pr:Lu 2 O 3 crystals were firstly investigated. • After co-doping low concentration of Pr3+, the near-infrared, ESA and up-conversion fluorescence were significantly quenched. • The spectral performance of Er:Lu 2 O 3 crystal was significantly improved at 2.7 μm by co-doping 0.05 at.% of Pr3+. [ABSTRACT FROM AUTHOR]