Attosecond twisted beams from high-order harmonicgeneration driven by optical vortices  

作　　者：Carlos Hernandez-Garcia Laura Rego Julio San Roman Antonio Picon Luis Plaja 

机构地区：[1]Grupo de Investigacion en Aplicaciones del Laser y Fotonica,Departamento de Fisica Aplicada,University of Salamanca,E-37008,Salamanca,Spain [2]Argonne National Laboratory,Argonne,1L 60439,USA

出　　处：《High Power Laser Science and Engineering》2017年第1期12-19,共8页高功率激光科学与工程（英文版）

基　　金：support from the Marie Curie International Outgoing Fellowship within the EU Seventh Framework Programme for Research and Technological Development(2007–2013),under REA grant Agreement No.328334;support from Junta de Castilla y León(Projects SA116U13,SA046U16);MINECO(Projects FIS2013-44174-P,FIS2016-75652P);support from the US Department of Energy,Office of Science,Basic Energy Sciences,Chemical Sciences,Geosciences,and Biosciences Division under the contract no.DE-AC02-06CH11357;support from the European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No.702565

摘　　要：Optical vortices are structures of the electromagnetic field with a spiral phase ramp about a point-phase singularity,carrying orbital angular momentum(OAM). Recently, OAM has been imprinted to short-wavelength radiation through high-order harmonic generation(HHG), leading to the emission of attosecond twisted beams in the extreme-ultraviolet(XUV) regime. We explore the details of the mapping of the driving vortex to its harmonic spectrum. In particular, we show that the geometry of the harmonic vortices is convoluted, arising from the superposition of the contribution from the short and long quantum paths responsible of HHG. Finally, we show how to take advantage of transverse phase-matching to select twisted attosecond beams with different spatiotemporal properties.Optical vortices are structures of the electromagnetic field with a spiral phase ramp about a point-phase singularity,carrying orbital angular momentum(OAM). Recently, OAM has been imprinted to short-wavelength radiation through high-order harmonic generation(HHG), leading to the emission of attosecond twisted beams in the extreme-ultraviolet(XUV) regime. We explore the details of the mapping of the driving vortex to its harmonic spectrum. In particular, we show that the geometry of the harmonic vortices is convoluted, arising from the superposition of the contribution from the short and long quantum paths responsible of HHG. Finally, we show how to take advantage of transverse phase-matching to select twisted attosecond beams with different spatiotemporal properties.

关 键 词：ATTOSECOND science EXTREME-ULTRAVIOLET vortices high harmonic GENERATION orbital angular momentum TWISTED BEAMS vortexbeams 

分 类 号：O4[理学—物理]