Polarized spectral characteristics and energy levels of Cr3+:LaSc3(BO3)4 crystal

The polarized absorption and emission spectra of Cr3+:LaSc3(BO3)4 crystal were investigated. The biaxial crystal of Cr3+:LaSc3(BO3)4 shows strong polarization dependence. The absorption and emission cross-sections are 1.68 × 10−20 cm2 at 654 nm and 6.13 × 10−20 cm−2 at 948 nm for E//x, respectively. The fluorescence lifetime of 4T2 → 4A2 transition is 17 μs at 300 K and 108 μs at 20 K, respectively. The energy levels of Cr3+:LaSc3(BO3)4 crystal were calculated based on Tanabe–Sugano theory. The results of spectroscopic characterization and calculated energy levels show that the Cr3+ ions in Cr3+:LaSc3(BO3)4 crystal occupy in a weak crystal field strength site.