Chinese Optics Letters, 2018, 16 (6): 061601, Published Online: Jul. 2, 2018
Investigation of the growth and optical properties of a Co 2 + -doped Na 5 Lu 9 F 32 single crystal
Abstract
A 0.1 mol.% CoF 2 -doped Na 5 Lu 9 F 32 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 peak position suggests cobalt ions in the divalent state in the grown crystal. Moreover, the cobalt ions are confirmed to locate in the distorted cubic crystal structure. Upon excitation of 500 nm light, a sharp emission peak at 747 nm ascribed to the T 2 2 ( H 1 ) → 4 A 2 ( F ) transition was observed for the crystal. The Co 2 + -doped Na 5 Lu 9 F 32 crystal shows a potentially promising material for the application of a passively Q -switched laser operating in the near-infrared range.
Lizhi Fang, Jianxu Hu, Haiping Xia, Jianli Zhang, Yongsheng Zhu, Baojiu Chen. Investigation of the growth and optical properties of a