Proximal selenium co-doping in Er:CaF 2 crystal for efficient 2.75 µm lasers

Optics Letters 2026

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Authors: Fan Zhang, Xuan Tong, Wudi Wang, Shuai Zhang, Wentao Hou, Qingsong Song, Dongzhen Li, Qingguo Wang, Chenbo Zhang, Xiaodong Xu, Huili Tang, jingjing Liu
+2 more Jie Liu, Jun Xu
DOI: 10.1364/ol.598901
Cited by: 1
References: 32

Abstract

Non-radiative relaxation hinders the performance of erbium-based mid-infrared lasers. Here, we demonstrate that anion-engineering in fluorite crystal provides a solution to this challenge, facilitating efficient laser operation. The Er,Se-co-doped CaF 2 crystal exhibits extended lifetimes at characteristic emission bands compared to Er:CaF 2 . First-principles calculations reveal the spatial proximity of Se 2− to Er 3+ clusters within CaF 2 lattice, alongside the introduction of low-frequency phonon modes, underpinning the observed phenomena. Efficient 2.75 µm continuous-wave laser operation was demonstrated on this crystal, exhibiting high slope efficiencies of 34.4% and 12.2% under 976 nm resonant and 1532 nm upconversion pumping, respectively. Our results highlight the role of anion-engineering in designing advanced laser materials.

Fields of Study & Subjects

Solid State Laser Technologies Luminescence Properties of Advanced Materials Laser Design and Applications

Publication details

Journal / source
Optics Letters
Publisher
Optica Publishing Group
Volume
51
Issue
11
Pages
3068–3068
Publication date
6 May 2026
Language
EN