Investigation of the growth and optical properties of a Co2+ doped Na5Lu9F32 sin

A 0.1 mol.% CoF2-doped Na5Lu9F32 single crystal with high quality in the size of ~??10 mm×100 mm was grown by the Bridgman method. Three peaks located at 504, 544, and 688 nm and a broad band in the range of 1200–1600 nm centered at 1472 nm were observed in the absorption spectra. The absorption pea