MgAl_2O_4:Cr^(3+)单晶光纤生长与荧光温度特性研究  

Growth and Fluorescence Temperature Characteristics of Cr^(3+) Doped MgAl_2O_4 Single Crystal Optical Fiber

作　　者：余露 叶林华[1] 包仁杰 张献伟 王立刚[1] 

机构地区：[1]浙江大学物理系,杭州310027

出　　处：《人工晶体学报》2017年第9期1672-1677,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(11674284);浙江省教育厅科技项目(Y201120872);中央高校基本科研业务费专项基金(2017FZA3005)

摘　　要：采用激光加热基座法制备了0.5at%Cr^(3+)掺杂镁铝尖晶石单晶光纤。通过XRD、荧光光谱、荧光寿命测试对所制备的单晶光纤的晶相、荧光温度特性进行了实验研究,结果表明所制备的MgAl_2O_4:Cr^(3+)单晶光纤的主晶相为MgAl_2O_4晶相,镁铝尖晶石晶相结构并没有因Cr^(3+)掺入而发生改变,在405 nm LED激发下,随着温度升高MgAl_2O_4:Cr^(3+)单晶光纤荧光强度下降,尤其是2E→4A2能级跃迁产生的荧光强度下降明显,同时随着温度的升高,MgAl_2O_4:Cr^(3+)单晶光纤的荧光寿命随温度单调下降,系统荧光寿命从室温293 K的7.74 ms下降到723 K的0.5 ms左右。由于其相对较长的荧光寿命,MgAl_2O_4:Cr^(3+)单晶光纤非常适合作为荧光温度敏感材料应用于荧光寿命型光纤温度传感器。MgAl2O4 single crystal optical fiber with 0. 5at% Cr3 ＋ions doped has been grown by laser heated pedestal growth method. The crystal structure and fluorescence temperature characteristics were tested by the X-ray diffraction（ XRD）,fluorescence emission spectra and fluorescent decay detection.The results indicate that the main phase of MgAl2O4：Cr3 ＋single crystal fiber was MgAl2O4 crystal phase,and the spinel crystal structure unchanged with the Cr3 ＋ions doped. With the increase of temperature,the fluorescence intensity of MgAl2O4：Cr3 ＋single crystal fiber decreases under a 405 nm LED excitation.Especially,the intensity of2 E →4A2transition decreases apparently. The fluorescence lifetime of the MgAl2O4：Cr3 ＋single crystal fiber decreases monotonously from 7. 74 ms to 0. 5 ms in the temperature range from 293 K to 723 K. The MgAl2O4：Cr3 ＋single crystal fiber is suitable well for fluorescence sensitized material of optical fiber temperature sensors based on fluorescence lifetime due to the relatively long fluorescence lifetime.

关 键 词：单晶光纤 镁铝尖晶石 荧光温度特性 光纤温度传感器 

分 类 号：O78[理学—晶体学] TP212.44[自动化与计算机技术—检测技术与自动化装置]