Two-color strong-field terahertz amplification in the non-identical focusing condition

doi:10.1063/5.0246226

	Two-color strong-field terahertz amplification in the non-identical focusing condition
	Zhao, Jingjing 1,2; Zhang, Yizhu 3; Gao, Yanjun 1,2; Chen, Ahai4,5 ; Jiang, Yuhai1,4,5,6
	2025-01-06
发表期刊	APPLIED PHYSICS LETTERS (IF:3.5[JCR-2023],3.5[5-Year])
ISSN	0003-6951
EISSN	1077-3118
卷号	126 期号:1
DOI	10.1063/5.0246226
摘要	High optical-to-terahertz (THz) conversion efficiency is crucial for generating THz waves. Strong-field ionization using a bi-focal bi-chromatic geometry produces cascading plasmas, leading to amplified THz generation and extended THz bandwidth. We investigate the effect of focal length in this bi-focal geometry on THz intensity. The results show that the THz intensity produced with non-identical focal lengths of the bi-chromatic fields is 25% higher than that of identical focal lengths, and 15 times higher than traditional bi-chromatic THz generation. The electro-optic sampling measurements reveal that the THz-electric-field intensity generated by the bi-focal bi-chromatic field exhibits periodic oscillations, which results from the modulation of the photoelectron's asymptotic velocity by the relative phase of the bi-chromatic pulses, and are consistent with the photocurrent model. The photocurrent simulations indicate that the self-compression of the second harmonic pulse significantly enhances THz amplification and extends the THz bandwidth. These findings deepen understanding of the THz generation mechanism and suggest potential avenues for optimizing THz sources.
关键词	Optical frequency conversion Surface discharges Focal geometry Focal lengths Focusing conditions Non-identical Optical- Strong field Strong field ionization Tera Hertz Terahertz generation Two-color
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收录类别	SCI ; EI
语种	英语
资助项目	National Natural Science Foundation of China["12174284","12374262","12334011"] ; null[2022YFA1604302]
WOS研究方向	Physics
WOS类目	Physics, Applied
WOS记录号	WOS:001390832500028
出版者	AIP Publishing
EI入藏号	20250417727586
EI主题词	Focusing
EI分类号	701.1 Electricity: Basic Concepts and Phenomena ; 741 Light, Optics and Optical Devices ; 741.1.1 Nonlinear Optics
原始文献类型	Journal article (JA)
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/470971
专题	物质科学与技术学院大科学中心_PI研究组_江玉海组
通讯作者	Zhang, Yizhu; Jiang, Yuhai
作者单位	1.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Tiangong Univ, Sch Elect Engn, Tianjin 300387, Peoples R China 4.ShanghaiTech Univ, Ctr Transformat Sci, Shanghai 201210, Peoples R China 5.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 6.Henan Normal Univ, Sch Phys, Xinxiang 453007, Peoples R China
通讯作者单位	上海科技大学; 物质科学与技术学院
推荐引用方式 GB/T 7714	Zhao, Jingjing,Zhang, Yizhu,Gao, Yanjun,et al. Two-color strong-field terahertz amplification in the non-identical focusing condition[J]. APPLIED PHYSICS LETTERS,2025,126(1).
APA	Zhao, Jingjing,Zhang, Yizhu,Gao, Yanjun,Chen, Ahai,&Jiang, Yuhai.(2025).Two-color strong-field terahertz amplification in the non-identical focusing condition.APPLIED PHYSICS LETTERS,126(1).
MLA	Zhao, Jingjing,et al."Two-color strong-field terahertz amplification in the non-identical focusing condition".APPLIED PHYSICS LETTERS 126.1(2025).