掺铒CaF2、SrF2、PbF2晶体的光谱性能与团簇结构研究
Spectroscopic Properties and Optical Clusters in Erbium-doped CaF2,SrF2 and PbF2 Crystals
TAM YU Puy Mang 1徐愉 2高泉浩 1周海琼 1张振 3尹浩 4李真 5吕启涛 6陈振强 5马凤凯 1苏良碧3
作者信息
- 1. 暨南大学 光电工程系,广东省晶体材料与激光技术工程研究中心,广州 510632;广东省光纤传感与通信重点实验室,广州 510632
- 2. 暨南大学 分析测试中心,广州 510632
- 3. 中国科学院 上海硅酸盐研究所,高性能陶瓷和超微结构国家重点实验室,上海 201899
- 4. 暨南大学 光电工程系,广东省晶体材料与激光技术工程研究中心,广州 510632;广东省工业超短脉冲激光技术重点实验室,深圳 518055
- 5. 暨南大学 光电工程系,广东省晶体材料与激光技术工程研究中心,广州 510632;广东省光纤传感与通信重点实验室,广州 510632;广东省工业超短脉冲激光技术重点实验室,深圳 518055
- 6. 广东省工业超短脉冲激光技术重点实验室,深圳 518055
- 折叠
摘要
3 μm波段中红外激光处于大气传输窗口,又可以作为基础光源,是激光技术研究的前沿.目前,铒离子激活的激光晶体材料是产生 3 μm中红外激光的重要途径之一.然而,Er3+离子 4I11/2 激光上能级荧光寿命较短,下能级4I13/2 的寿命较长,难以实现粒子数反转,导致自终止现象.为了解决这一难题,往往需要高浓度掺杂,通过能量传递降低 4I13/2 能级的寿命.然而高浓度掺杂又会造成晶体热性能变差,限制了掺 Er3+激光晶体效率和功率.三阶铒离子容易在氟化物晶体中形成团簇,导致稀土离子间距缩短,即使在低掺杂浓度下稀土离子之间的能量传递作用仍较为显著.同时,低浓度掺杂还可以减轻激光运转下晶体的热堆积效应.掺铒氟化物晶体已成为一类重要的高功率、高效率中红外激光材料.然而,掺铒氟化物晶体的光谱性能与铒离子团簇结构之间的相互联系尚不明确,制约了掺铒氟化物晶体光谱和激光性能的进一步发展.本文采用第一性原理计算模拟了铒离子在 CaF2、SrF2 和 PbF2晶体中的团簇结构.结果显示,铒离子团簇结构随基质晶体变化逐渐演变.结合模拟计算和实验表征定性揭示了不同晶体离子团簇与光谱性能的联系,为掺铒氟化物中红外激光晶体材料的调控与设计提供参考.
Abstract
As a fundamental light source and a good window for atmospheric transmission,the mid-infrared 3 μm lasers have led many promising applications.The rare earth doped crystalline materials,such as erbium doped crystals,are some of the most important routes for generation of the lasers.However,they have an intrinsic shortcoming of self-termination because of their short lifetime of 4I11/2 and longer lifetime of 4I13/2.To eliminate this effect,a high concentration doping method is usually adopted to change the energy transfer process to decrease 4I13/2 lifetime.The efficiency and output power of Er3+-doped crystals were thus limited due to their degraded thermal properties.Trivalent erbium ions are easily clustering in fluoride crystals.Distances among the ions are short and therefore energy transfer processes could be significantly improved in the crystals even doping with low concentrations.Low doping concentrations could also alleviate the thermal effect in laser operations,which enable the erbium doped fluorides to be promising candidates for high power and high efficiency mid-infrared lasers.However,connection of spectral properties and erbium clusters is unknown.Here,the first principles calculation is utilized to model the erbium ion clusters in CaF2,SrF2 and PbF2 crystals,concerning the absorption and photoluminescence properties.The results reveal that spectral properties and structures of the erbium clusters,evolve gradually with matrix crystals.Relationship between spectral properties and optical erbium clusters is determined qualitatively,which could be used to design new erbium doped mid-infrared lasers.
关键词
铒/掺杂/氟化物晶体/铒离子团簇/光谱性能Key words
erbium/doping/mid-infrared laser crystal/erbium cluster/spectroscopic property引用本文复制引用
基金项目
国家重点研发计划(2022YFB3605702)
国家自然科学基金(61925508)
国家自然科学基金(61905289)
Keyarea Research and Development Program of Guangdong Province(2020B090922006)
广州市科技计划(202201010427)
CAS Project for Young Scientists in Basic Research(YSBR-024)
出版年
2024
国家科技期刊平台
NSTL
万方数据