发光学报, 2016, 37 (10): 1189, 网络出版: 2017-01-13  

Er3+掺杂Na5Lu9F32单晶体的红外光学特性

Infrared Optical Properties of Er3+ Doped Na5Lu9F32 Single Crystal
作者单位
1 宁波大学 光电子功能材料重点实验室, 浙江 宁波 315211
2 中国科学院 宁波材料技术与工程研究所, 浙江 宁波 315211
3 大连海事大学 物理系, 辽宁 大连 116026
摘要
采用坩埚下降法成功地生长了Er3+离子掺杂的Na5Lu9F32(NLF)单晶体。测定了单晶体在400~2 500 nm波段的吸收光谱与2.5~25 μm红外波段的透过光谱。Na5Lu9F32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2.7 μm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Er3+在单晶体中的光学强度参数Ωt(Ω2=2.08,Ω4=2.07,Ω6=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 cm2(4I13/2→4I15/2)和1.66×10-20 cm2(4I11/2→4I13/2)。在980 nm半导体激光器(LD)激发下, 研究了单晶体的近红外1.5 μm与中红外2.7 μm的发射光谱特性。
Abstract
Er3+ doped Na5Lu9F32 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. Na5Lu9F32 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 cm2(4I13/2→4I15/2) and 1.66×10-20 cm2(4I11/2→4I13/2) estimated by Futchbauer-Ladenburg formula. The emission spectra of 1.5 μm and 2.7 μm band were investigated under 980 nm LD.

汤庆阳, 王成, 夏海平, 何仕楠, 江浩川, 陈宝玖. Er3+掺杂Na5Lu9F32单晶体的红外光学特性[J]. 发光学报, 2016, 37(10): 1189. TANG Qing-yang, WANG Cheng, XIA Hai-ping, HE Shi-nan, JIANG Hao-chuan, CHEN Bao-jiu. Infrared Optical Properties of Er3+ Doped Na5Lu9F32 Single Crystal[J]. Chinese Journal of Luminescence, 2016, 37(10): 1189.

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