强激光太赫兹辐射源研究现状与发展趋势分析  

Analysis of Current Status and Development Trends of Terahertz Radiation Sources Based on Strong Laser Pulses

作　　者：蔡杰 耿易星 余金清 颜学庆[1] Cai Jie;Geng Yixing;Yu Jinqing;Yan Xueqing(State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China;School of Physics and Electronics,Hunan University,Changsha 410082,Hunan,China)

机构地区：[1]北京大学物理学院核物理与核技术国家重点实验室,北京100871 [2]湖南大学物理与微电子科学学院,湖南长沙410082

出　　处：《中国激光》2023年第17期113-128,共16页Chinese Journal of Lasers

基　　金：国家重点研发计划(2019YFF01014402);国家自然科学基金创新研究群体项目(11921006);国家自然科学基金(12175058)。

摘　　要：太赫兹源在无线通信、光谱学、生物医学成像和材料科学等领域具有极高的应用价值。近年来,对高品质强太赫兹源的需求更为迫切,而有效产生高品质强太赫兹源仍然是太赫兹科学中的关键科学问题。概述了几种激光太赫兹源的产生机制以及发展现状:非线性晶体可以高效率产生太赫兹源,但受到晶体能量损伤阈值限制,难于在超强激光条件下工作;气体等离子体太赫兹源可以突破电离阈值的限制,但太赫兹能量会随着激光强度的升高而饱和,无法进一步提升太赫兹的场强;固体靶等离子体是相对论电子在等离子体中动力学行为产生的超强太赫兹辐射,并且可以通过结构靶等方式调制太赫兹品质,有望高效率地产生高品质强太赫兹源。最后,总结和展望了太赫兹源在应用领域的发展趋势。Significance Terahertz waves have wide applications in fields such as communication,astronomy,material detection,physical control,and charged particle acceleration and diagnostics.In recent years,the development of terahertz sources has become an important frontier topic in terahertz science.With the continuous development of 5G communication,the carrying capacity of the microwave band is insufficient to meet future communication demands,making terahertz waves with shorter wavelengths the focus of future communication solutions.Compared with microwaves,the terahertz band has a stronger information carrying capacity and is recognized as a band for the next-generation 6G communication that is yet to be further developed.Terahertz waves exhibit high absorption and non-biological damage effects in water molecules,making them suitable for non-destructive imaging and research analysis of biomolecules.Terahertz waves can resonantly couple with the partial motion states of ions,electrons,and spins in matter,making them useful for material excitation and spectroscopic analysis.In solids,the energy of terahertz photons is consistent with the energy required for lattice vibrations(phonons),collisions of free electrons,binding energy of electron-hole pairs(excitons),and decay of spin waves(magnons).Therefore,terahertz waves can probe the linear response of materials without causing changes in their properties,making them widely applicable in the study of fundamental processes in complex materials.In recent years,terahertz waves,as pump pulses,have been expanded to applications in biophotonics,material resonances,magnetization control,electron beam measurements,charged particle acceleration,and other areas of research.These applications have placed higher requirements on the intensity and quality of terahertz pulses.As the application areas of terahertz continue to expand,there are increasing demands for the quality of terahertz waves.The quest for high-quality terahertz sources has always been a key scientific problem in the

关 键 词：非线性光学 太赫兹 光学晶体 等离子体 阵列波导器件 

分 类 号：O436[机械工程—光学工程]