Growth and spectroscopic characteristics of Cr3+:CsAl(MoO4)2 crystal

This paper reports the growth and spectroscopic characteristics of Cr3+:CsAl(MoO4)2 crystal. A Cr3+:CsAl(MoO4)2 crystal with dimensions of 42 mm × 37 mm × 10 mm has been successfully grown from a flux of Cs2Mo3O10 by the TSSG method. The absorption and emission spectra were investigated. The absorption cross sections σa are 5.05 × 10−20 cm−2 at 481 nm for the 4A2 → 4T1 transition and 3.06 × 10−20 cm−2 at 670 nm for the 4A2 → 4T2 transition of Cr3+ ions, respectively. The emission cross section σe of 4T2 → 4A2 transition is 4.27 × 10−20 cm2 at 818 nm and fluorescence lifetime is 21 μs. Based on the absorption and emission spectra, the crystal field strength Dq, the Racah parameters B and C, the effective phonon energy ħω and the Huang–Rhys factor S were calculated. The investigated results show that Cr3+:CsAl(MoO4)2 crystal may be regarded as a potential tunable laser crystal material.