中文摘要：

采用坩埚下降法成功地生长了Er~（3＋）离子掺杂的Na_5Lu_9F_（32）（NLF）单晶体。测定了单晶体在400~2 500nm波段的吸收光谱与2.5~25μm红外波段的透过光谱。Na_5Lu_9F_（32）单晶体在400~7 150 nm宽波段范围具有好的光学透过性,在该波段的透过率达到90%。在透过光谱中几乎观察不到2.7μm中红外波段的吸收,说明单晶体中OH~-离子的含量极低。根据测定的吸收光谱,通过Judd-Ofelt理论计算了Er~（3＋）在单晶体中的光学强度参数Ω_t（Ω_2=2.08,Ω_4=2.07,Ω_6=0.75）,以及相应的辐射跃迁速率、荧光分支比和荧光寿命。根据Futchbauer-Ladenburg公式估算了样品的发射截面大约分别为1.42×10~（-20）cm~2（~4I_（13/2）→~4I_（15/2））和1.66×10~（-20）cm~2（~4I_（11/2）→~4I_（13/2））。在980 nm半导体激光器（LD）激发下,研究了单晶体的近红外1.5μm与中红外2.7μm的发射光谱特性。

英文摘要：

Er~（3＋）doped Na_5Lu_9F_（32） single crystal was successfully grown by Bridgman method.The absorption spectra of the single crystal from 400 nm to 2 500 nm and the transmission characteristics from 2.5 μm to 25 μm were measured.Na_5Lu_9F_（32） single crystal possessed high optical transmittance from 400 nm to 7 150 nm wide band,and the transmittance reached to 90%.Almost no absorption of 2.7 μm band was observed.It indicated that the content of OH-ion was very low in the single crystal.The intensity parameters Ωt（ Ω2= 2.08,Ω4= 2.07,Ω6= 0.75） were calculated by using Judd-Ofelt theory based on the absorption spectrum.The radiative transition rates,branching ratios and radiative lifetimes were also obtained.The emission cross sections of the sample were 1.42 ×10~（-20）cm~2（~4I_（13/2）→~4I_（15/2）） and 1.66 × 10~（-20）cm~2（~4I_（11/2）→~4I_（13/2）） estimated by Futchbauer-Ladenburg formula.The emission spectra of 1.5 μm and 2.7 μm band were investigated under 980 nm LD.