标题：Growth, thermal and spectral properties, and laser performance of Tm3+:CNGS crystal
作者：Ma, Congyu; Wang, Yiming; Gao, Cunyuan; Cheng, Xiufeng; Xue, Mei; Sun, Zhihua; Guo, Shiyi; Zhang, Baitao
作者机构：[Ma, Congyu; Wang, Yiming; Gao, Cunyuan; Cheng, Xiufeng; Guo, Shiyi; Zhang, Baitao] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, 更多
通讯作者：Guo, Shiyi;Guo, SY;Zhang, BT
通讯作者地址：[Guo, SY; Zhang, BT]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China.
摘要：New composite functional crystals of Tm3+:Ca3NbGa3Si2O14 (Tm3+:CNGS) were successfully grown by the Czochralski (CZ) method. The structural, thermal and spectral properties of Tm3+:CNGS crystals were investigated. The laser output of a Tm3+:CNGS crystal in the 2 m band was studied for the first time. The results showed that Tm3+:CNGS achieved a maximum output of 740 mW at a pump power of 5 W, and the slope efficiency and light-to-light conversion efficiency reached 17.07% and 14%, respectively. The thermal properties are presented, and the coefficient of linear thermal expansion of Tm3+:CNGS increased with respect to that of a pure CNGS crystal in the Z-axis direction, which may have been due to a change in the bulk density of the oxygen dodecahedron in the X-axis direction after partial replacement of the rare earth ions. In addition, the specific heat, thermal diffusivity, and thermal conductivity of Tm3+:CNGS slightly increased in comparison with those of the undoped CNGS crystal. The absorption spectra of Tm3+:CNGS had a strong peak at 793 nm, and its absorption cross-section was 5.01 x 10(-21) cm(2). The fluorescence spectra at room temperature had a full width at half maximum (FWHM) of 164 nm and a peak wavelength of 1888 nm, and the lifetime of the F-3(4) upper energy level of the laser was 2.345 ms. Its good thermal properties, large emission linewidth, and ease of growth indicate that a Tm3+:CNGS single crystal could have the potential to be a good laser gain medium.