Scheme for generation of spatiotemporal optical vortex attosecond pulse trains  

作　　者：JIAHAO DONG LIANG XU YIQI FANG HONGCHENG NI FENG HE SONGLIN ZHUANG YI LIU 

机构地区：[1]Shanghai Key Laboratory of Modern Optical System,University of Shanghai for Science and Technology,Shanghai 200093,China [2]Fachbereich Physik,Universität Konstanz,78464 Konstanz,Germany [3]State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200241,China [4]Key Laboratory for Laser Plasmas(Ministry of Education)and School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [5]CAS Center for Excellence in Ultra-intense Laser Science,Shanghai 201800,China

出　　处：《Photonics Research》2024年第10期2409-2417,共9页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(12034013,12204308,11925405);Shanghai Science and Technology Commission(22ZR1444100)。

摘　　要：The realization of spatiotemporal vortex structure of various physical fields with transverse orbital angular momentum(OAM)has attracted much attention and is expected to expand the research scope and open new opportunities in their respective fields.Here we present theoretically the first,to the best of our knowledge,study on the generation of attosecond pulse trains featuring a spatiotemporal optical vortex(STOV)structure by a twocolor femtosecond light field,with each color carrying transverse OAM.Through careful optimization of relative phase and intensity ratio,we validate the efficient upconversion of the infrared pulse into its tens of order harmonics,showing that each harmonic preserves a corresponding intact topological charge.This unique characteristic enables the synthesis of an extreme ultraviolet attosecond pulse train with transverse OAM.In addition,we reveal that ionization depletion plays an outsize role therein.Our studies pave the way for the generation and utilization of light fields with STOV in the attosecond regime.

关 键 词：VORTEX TRANSVERSE HARMONICS 

分 类 号：O43[机械工程—光学工程]