1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022，China 2. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080，China
Abstract：A series of high quality ZnWO4:Tm3+ single crystals were grown with Czochralski method. The concentrations of thulium ions were 0.1, 0.3, 0.5, 0.7 and 1.0 mol%，respectively. When ZnWO4: Tm3+ single crystals were excited by 807 nm laser, the up-conversion luminescence peaks at 486 and 695 nm which corresponded to transitions 1G4→3H6 and 3F3→3H6， respectively，were detected. The intensity of 695 nm luminescence varied with the pump power in a double logarithmic relation whose indexes were 0.8 and 1.1 orders，respectively.
[1] Carter J N, Smart R G, Tropper A C et al. Journal of Non-Crystalline Solids, 1992, 140: 10. [2] Patel D N, Reddy B R，Stevenso S K. Applied Optics, 1999, 38(15): 3271. [3] Fujiware H，Sasaki K. J. Appl. Phys.，1999, 86: 2385. [4] ZANG Jing-cun，LIU Yan-ｘing，CAO Jie et al(臧竞存, 刘燕行, 曹 杰等). Acta Physica Sinica(物理学报), 1998, 47(1): 117. [5] ZANG Jing-cun，XU Dong-yong，ZOU Yu-lin et al(臧竞存, 徐东勇, 邹玉林等). J． of Optoelectronics Laser(光电子·激光), 2002, 13(1): 43. [6] ZANG Jing-cun，XU Dong-yong，ZOU Yu-lin et al(臧竞存, 徐东勇, 邹玉林等). J． of the Chinese Rare Earth Society(中国稀土学报)，2001, 1(6): 611.
