High efficient and broadband ∼3.5 μm emission of Er3+:YAG crystal

Jianhui Huang; Bo Wang; Weixiong You; Liaolin Zhang; Yijian Sun; Chaoyang Tu; Guoliang Gong; Yao Liu

doi:10.1016/j.saa.2021.119587

High efficient and broadband ∼3.5 μm emission of Er³⁺:YAG crystal

Spectrochim Acta A Mol Biomol Spectrosc. 2021 Sep 5:258:119587. doi: 10.1016/j.saa.2021.119587. Epub 2021 Feb 14.

Authors

Jianhui Huang¹, Bo Wang², Weixiong You¹, Liaolin Zhang³, Yijian Sun¹, Chaoyang Tu¹, Guoliang Gong⁴, Yao Liu⁵

Affiliations

¹ College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, PR China.
² School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong 529020, PR China.
³ College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, PR China. Electronic address: zhangliaolin@126.com.
⁴ College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, PR China. Electronic address: gonggl@jxust.edu.cn.
⁵ Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, PR China.

PMID: 33910105
DOI: 10.1016/j.saa.2021.119587

Abstract

The YAG single crystals doped with 10 at.%, 20 at.% and 50 at.% Er³⁺ were successfully grown by the micro-pulling down method and spectroscopic properties of the crystals were investigated. The main interest was focus on the relation between the Er³⁺ concentration and ∼3.5 μm emission of Er³⁺:YAG crystals. Room temperature absorption spectra were analyzed by the Judd-Ofelt theory. The stimulated emission cross-sections were calculated by the Füchtbauer-Ladenburg equation. The fluorescence intensities and peak emission cross-sections of the crystals at ∼3.5 μm are slightly decreasing with the increase of Er³⁺ concentration. The trend of the emission properties in NIR and visible region with the Er³⁺ concentration was also discussed and compared. The results indicate that the highly doped Er³⁺ concentration is beneficial to realize the ∼3.5 µm laser output.

Keywords: 3.5 μm laser; Er(3+):YAG crystal; Micro-pulling down method; Spectroscopic properties.