Optimum fluorescence emission around 1.8 μm for LiYF4 single crystals of various Tm3＋-doping concentrations

In this paper, optical spectra of LiYF4 single crystals doped with Tm3＋ ions of various concentrations are reported. The emission intensity at 1.8 ktm first increases with increasing Tm3＋ concentration, and reaches a maximum value when the concentration of Tm3＋ is about 1.28 mol%, then it decreases...

Full description

Saved in:
Bibliographic Details
Published in中国物理B：英文版 no. 10; pp. 551 - 556
Main Author 李珊珊 夏海平 符立 董艳明 谷雪梅 章践立 王冬杰 张约品 江浩川 陈宝玖
Format Journal Article
LanguageEnglish
Published 01.10.2014
Subjects
中红外激光器
使用寿命
单晶
发光寿命
发光强度
浓度增加
荧光发射
铥离子
Online AccessGet full text

Cover

More Information
Summary:In this paper, optical spectra of LiYF4 single crystals doped with Tm3＋ ions of various concentrations are reported. The emission intensity at 1.8 ktm first increases with increasing Tm3＋ concentration, and reaches a maximum value when the concentration of Tm3＋ is about 1.28 mol%, then it decreases rapidly as the concentration of Tm3＋ further increases to 3.49 mol%. The emission lifetime at 1.8 p.m also shows a similar tendency to the emission intensity. The maximum lifetime of 1.8 μm is measured to be 17.68 ms for the sample doped with Tm3＋ of 1.28 mol%. The emission cross section of 3F4 level is calculated. The maximum reaches 3.76 × 10 -21 cm2 at 1909 nm. The cross relaxation （3H6, 3H4 →3 F4, 3F4） between Tm3＋ ions and the concentration quenching effect are mainly attributed to the change of emission with Tm3＋ concentration. The largest quantum efficiency between Tm3＋ ions is estimated to be ,-147% from the measured lifetime and calculated radiative lifetime. All the results suggest that the Tm3＋/LiYF4 single crystal may have potential applications in 2 μm mid-infrared lasers.
Bibliography:In this paper, optical spectra of LiYF4 single crystals doped with Tm3＋ ions of various concentrations are reported. The emission intensity at 1.8 ktm first increases with increasing Tm3＋ concentration, and reaches a maximum value when the concentration of Tm3＋ is about 1.28 mol%, then it decreases rapidly as the concentration of Tm3＋ further increases to 3.49 mol%. The emission lifetime at 1.8 p.m also shows a similar tendency to the emission intensity. The maximum lifetime of 1.8 μm is measured to be 17.68 ms for the sample doped with Tm3＋ of 1.28 mol%. The emission cross section of 3F4 level is calculated. The maximum reaches 3.76 × 10 -21 cm2 at 1909 nm. The cross relaxation （3H6, 3H4 →3 F4, 3F4） between Tm3＋ ions and the concentration quenching effect are mainly attributed to the change of emission with Tm3＋ concentration. The largest quantum efficiency between Tm3＋ ions is estimated to be ,-147% from the measured lifetime and calculated radiative lifetime. All the results suggest that the Tm3＋/LiYF4 single crystal may have potential applications in 2 μm mid-infrared lasers.
Li Shan-Shan, Xia Hai-Ping, Fu Li, Dong Yan-Ming, Gu Xue-Mei, Zhang J1an-L1, Wang Dong-Jie, Zhang Yue-Pin, Jiang Hao-Chuan, and Chen Bao-Jiu（ a） Key Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 31521 I, China b）Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 31521 I, China C） Department of Physics, Dalian Maritime University, Dalian 116026, China
11-5639/O4
Tm3＋-doped LiYF4 crystal, cross relaxation, fluorescence emission, 1.8 μm
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/23/10/107806