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作 者:姬瑶 王伟超[1] 肖永宝 叶诣琛 张勤远[1] 姜中宏[1] JI Yao;WANG WeiChao;XIAO YongBao;YE YiChen;ZHANG QinYuan;JIANG ZhongHong(State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,South China University of Technology,Guangzhou 510640,China)
机构地区:[1]华南理工大学发光材料与器件国家重点实验室,广东省光纤激光材料与应用技术重点实验室,广州510640
出 处:《中国科学:物理学、力学、天文学》2022年第6期50-66,共17页Scientia Sinica Physica,Mechanica & Astronomica
基 金:国家自然科学基金(编号:52130201,U1830203)资助项目。
摘 要:光纤激光器是大功率激光、卫星激光通信、引力波探测等国家安全与科学前沿领域发展的迫切与重大需求,稀土离子掺杂的玻璃光纤是光纤激光器的核心工作介质和关键科学难题.氟硫磷酸盐(FSP)玻璃有望继承磷酸盐玻璃良好的成玻性能及光学光谱特性,氟化物与硫酸盐的引入有助于降低玻璃的非线性效应并提升稀土离子的跃迁概率,在新型光纤激光器的应用中具有较大潜力.然而,阐明FSP玻璃复杂的结构特征及其成分-结构-性质关系仍是目前研究的难点之一.本文研究了多种FSP玻璃的结构、力学、热学与Er^(3+)掺杂光学光谱等特性.在电价单位理论基础上提出FSP玻璃的混合离子结构,揭示了其共价交联与离子作用并重的结构特征.混合离子结构特征参数如平均堆积密度、交联度、局域电价单位等可有效阐明FSP玻璃的密度、弹性模量、特征温度、折射率及光谱特性的变化规律.进一步地,研究还发现FSP玻璃特殊的混合离子结构使掺杂的稀土离子处于电荷密度涨落的配位体环境,因而有利于提升Er^(3+)在FSP玻璃中的发射截面(1.1×10^(-20)cm^(2))、光谱品质因子(5.8×10^(-23)s cm^(2))和增益带宽(73.8×10^(-27)cm^(3))等光谱特性,有望应用于高性能单频与高重频光纤激光器.Fiber lasers meet the urgent and major requirements for developing high-power lasers,satellite laser communications,gravitational wave detections,and other national security and science frontiers.Glass fibers doped with rare-earth ions are the gain medium in fiber lasers.Fluoro-sulfo-phosphate(FSP)glass inherits the excellent glass-forming ability and spectral characteristics of phosphate glass and could serve as a possible gain medium for fiber laser devices with the reduction in its nonlinear effect and an increase in the radiative probability of rare-earth ions by introducing fluoride and sulfate.However,explaining its complicated structural characteristics and composition-structure-property relation is still one of the major challenges in the current research on FSP glasses.Herein,the structural,mechanical,thermal,and Er^(3+)-doped spectroscopic properties of several FSP glasses are studied.Based on the valence unit theory,the mixed-ionic structure of FSP glasses embodying the equal importance of covalent cross-linking and ionic interactions has been proposed.The density,elastic modulus,characteristic temperatures,refractive index,and spectral properties of FSP glasses could be elucidated by mixed-ionic structural parameters,including average packing density,network cross-links,and valence unit in the local environment.Furthermore,the mixed-ionic structure provides local ligands with fluctuating electron density and increases the emission cross-section(1.1×10^(-20)cm^(2)),figure of merit(5.8×10^(-23)s cm^(2)),and gain-2733+bandwidth(73.8×10^(-27)cm^(3))of Er^(3+)in FSP glasses,implying high possibility for their application in high-performance,single-frequency,and high-repetition-rate fiber lasers.
关 键 词:光纤激光器 激光玻璃 氟硫磷酸盐玻璃 混合离子结构 Er^(3+)
分 类 号:TN248[电子电信—物理电子学] TQ171.7[化学工程—玻璃工业]
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