Attosecond vortex pulse trains

被引：8

作者：

De las Heras, Alba ^{[1
,2
]}

Schmidt, David ^{[3
]}

Roman, Julio San ^{[1
,2
]}

Serrano, Javier ^{[1
,2
]}

Barolak, Jonathan ^{[3
]}

Ivanic, Bojana ^{[3
]}

Clarke, Cameron ^{[3
]}

Westlake, Nathaniel ^{[3
]}

Adams, Daniel E. ^{[3
]}

Plaja, Luis ^{[1
,2
]}

Durfee, Charles G. ^{[3
]}

Hernandez-Garcia, Carlos ^{[1
,2
]}

机构：

[1] Univ Salamanca, Dept Fis Aplicada, Grp Invest Aplicac Laser & Foton, E-37008 Salamanca, Spain

[2] Univ Salamanca, Unidad Excelencia Luz & Mat Estructuradas LUMES, Salamanca, Spain

[3] Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA

来源：

OPTICA | 2024年 / 11卷 / 08期

基金：

欧洲研究理事会;

关键词：

ORBITAL ANGULAR-MOMENTUM; HIGH-HARMONIC GENERATION; POLARIZATION; LIGHT; IONIZATION; PHYSICS; DRIVEN; PHASE; BEAMS;

D O I：

10.1364/OPTICA.517702

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The landscape of ultrafast structured light pulses has significantly advanced thanks to the ability of high-order harmonicgeneration (HHG) to translate the spatial properties of infrared laser beams to the extreme-ultraviolet (EUV) spectralrange. In particular, the up-conversion of orbital angular momentum (OAM) has enabled the generation of high-orderharmonics whose OAM scales linearly with the harmonic order and the topological charge of the driving field. Havinga well-defined OAM, each harmonic is emitted as an EUV femtosecond vortex pulse. However, the order-dependentOAM across the harmonic comb precludes the synthesis of attosecond vortex pulses. Here we demonstrate a methodfor generating attosecond vortex pulse trains, i.e., a succession of attosecond pulses with a helical wavefront, resultingfrom the coherent superposition of a comb of EUV high-order harmonics with thesameOAM. By driving HHG with apolarization tilt-angle fork grating, two spatially separated circularly polarized high-order harmonic beams with order-independent OAM are created. Our work opens the route towards attosecond-resolved light-matter interactions withtwo extra degrees of freedom, spin and OAM, which are particularly interesting for probing chiral systems and magneticmaterials.

引用

页码：1085 / 1093

页数：9

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