Isolated attosecond pulse generation in a semiinfinite gas cell driven by time-gated phase matching  

作　　者：Federico Vismarra Marina Fernández-Galán Daniele Mocci Lorenzo Colaizzi Víctor Wilfried Segundo Roberto Boyero-García Javier Serrano Enrique Conejero-Jarque Marta Pini Lorenzo Mai Yingxuan Wu Hans Jakob Wörner Elisa Appi Cord LArnold Maurizio Reduzzi Matteo Lucchini Julio San Román Mauro Nisoli Carlos Hernández-García Rocío Borrego-Varillas 

机构地区：[1]Department of Physics,Politecnico di Milano,Piazza Leonardo da Vinci 32,20133 Milano,Italy [2]IFN-CNR,Piazza Leonardo da Vinci 32,20133 Milano,Italy [3]Grupo de Investigación en Aplicaciones del Láser y Fotónica,Departamento de Física Aplicada,Universidad de Salamanca,E-37008 Salamanca,Spain [4]Unidad de Excelencia en Luz y Materia Estructuradas(LUMES),Universidad de Salamanca,Salamanca,Spain [5]Laboratorium für Physikalische Chemie,ETH Zürich,8093 Zürich,Switzerland [6]Department of Physics,Lund University,Lund,Sweden

出　　处：《Light(Science & Applications)》2024年第10期2192-2200,共9页光（科学与应用)（英文版）

基　　金：funding from the European Union’s Horizon 2020 research and innovation programme(grant agreement No 871161,IMPULSE)and European Research Council(ERC):ERC Synergy grant agreement no.

摘　　要：Isolated attosecond pulse(IAP)generation usually involves the use of short-medium gas cells operated at high pressures.In contrast,long-medium schemes at low pressures are commonly perceived as inherently unsuitable for IAP generation due to the nonlinear phenomena that challenge favourable phase-matching conditions.Here we provide clear experimental evidence on the generation of isolated extreme-ultraviolet attosecond pulses in a semiinfinite gas cell,demonstrating the use of extended-medium geometries for effective production of IAPs.To gain a deeper understanding we develop a simulation method for high-order harmonic generation(HHG),which combines nonlinear propagation with macroscopic HHG solving the 3D time-dependent Schrödinger equation at the singleatom level.Our simulations reveal that the nonlinear spatio-temporal reshaping of the drivingfield,observed in the experiment as a bright plasma channel,acts as a self-regulating mechanism boosting the phase-matching conditions for the generation of IAPs.

关 键 词：MATCHING nonlinear ULTRAVIOLET 

分 类 号：O56[理学—原子与分子物理]