Optical spectroscopy of low-phonon Ho3+ doped BaY2F8 single crystal

Abstract

The Ho:BaY 2 F 8 crystal was grown by Czochralski method. The crystal phase structure and absorption spectra were tested, the absorption peak exists near 899 nm, the absorption cross section was 1.27 × 10 -21 cm 2 . The emission spectra of crystals in the vicinity of 2 and 3.9 μm were measured, the 2 μm near infrared light induced by 5 I 7 5 I 8 transition of Ho 3+ ions was observed, as well as the fluorescence output at 3.9 μm ( 5 I 5 5 I 6 ), emission cross section at 3.9 μm was calculated to be 0.86 × 10 -21 cm 2 . We suppose that the Ho:BaY 2 F 8 crystal has a large application prospect for the 2-4 μm wavelength near infrared laser.