Nd:CaNb_2O_6晶体的生长及光谱性质  

Growth and Spectral Properties of Nd:CaNb_2O_6 Crystal

作　　者：程艳[1] 辛征[2] 徐晓东[1] 徐军[3] 周圣明[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]山东建筑大学信息与电气工程学院,山东济南250101 [3]中国科学院上海硅酸盐研究所,上海200050

出　　处：《中国激光》2009年第6期1523-1527,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(60544003;60425516)资助项目

摘　　要：采用提拉法沿c向成功生长出质量优良的Nd∶CaNb_2O_6新型单晶。测量了晶体的室温吸收光谱,在808 nm处吸收截面为5.04×10^(20)cm^2,吸收带宽为8 nm。根据Judd-Ofeit理论,拟合出晶体场强度参数Ω_((?)=2,4,6)∶Ω_2=5.321×10^(20)cm^2,Ω_4=1.734×10^(20)cm^2,Ω_6=2.889×10^(-20)cm^2。荧光辐射寿命τ_(rad)为167.02 μs,计算的荧光分支比β为∶β_1=36.03%,β_2=52.29%,β_3=11.15%,β_1=0.533%。这些良好的光谱性质表明Nd∶CaNb_2O_6晶体将成为固态激光器中有潜力的激光增益介质。New single crystal Nd ： CaNb2O6 is successfully grown by using the Czochralski method along the cdirection. Absorption spectra are measured at room temperature. Peak absorption cross section is calculated to be 5.04×10^-20 cm^2 with a broad FWHM of 8 nm at 808 nm. Based on Judd-Ofelt theory, the parameters of line strengths Ωt（t=2.4.6） are fitted and the values are Ω2 = 5. 321×10^-20 cm^2, Ω4=1.734×10^-20 cm^2, and Ω6= 2. 889×10^-20 cm^2 . The radiative lifetime is 167.02 μs. The fluorescence branch ratios are calculated： β1 = 36.03 %, β2 = 52.29 %, β3 = 11.15 %, β4 = 0. 533 %. Good spectroscopic properties show that the Nd ： CaNb2 06 crystal is a potential laser gain medium of solid-state laser.

关 键 词：材料 Nd:CaNb2O6单晶 吸收光谱 Judd—Ofelt理论 

分 类 号：O782.5[理学—晶体学] O734