Spatiotemporal coupling of attosecond pulses

Summary, in English

Attosecond pulses in the extreme ultraviolet (XUV) spectral range are today routinely generated via high-order harmonic generation (HHG), when intense ultrashort laser pulses are focused into a gaseous generation medium. The effect is most easily understood in a semi-classical picture [1]. An electron can tunnel ionize from the distorted atomic potential, pick up kinetic energy in the laser field, potentially return to its parent ion and recombine. The excess energy is emitted as XUV photon. The process repeats for every half-cycle of the driving field, resulting in a train of attosecond pulses and in the frequency domain in the well-known, odd-order comb of harmonics. Two main families of electron trajectories leading to the same photon energy can be distinguished into “short” and “long”, according to their time of travel in the continuum. Due to the complicated nature of the HHG process, attosecond pulses usually cannot be separated into their temporal and spatial profiles, but instead have strong chromatic aberration and are spatio-temporally coupled [2-4].

• Författare: Cord L. Arnold; Hampus Wikmark; Chen Guo; Jan Vogelsang; Peter W. Smorenburg; Hélène Coudert‐Alteirac; Jan Lahl; Jasper Peschel; Piotr Rudawski; Hugo Dacasa; Stefanos Carlström; Sylvain Maclot; Mette B. Gaarde; Per Johnsson; Anne L'Huillier
• Avdelning/ar: NanoLund: Centre for Nanoscience; Atomfysik
• Publiceringsår: 2019
• Språk: Engelska
• Publikation/Tidskrift/Serie: Optics InfoBase Conference Papers
• Volym: Part F140-CLEO_Europe 2019
• Dokumenttyp: Konferensbidrag
• Förlag: Optical Society of America
• Ämne: Atom and Molecular Physics and Optics
• Conference name: The European Conference on Lasers and Electro-Optics, CLEO_Europe_2019
• Conference date: 2019-06-23 - 2019-06-27
• Conference place: Munich, Germany
• Status: Published
• ISBN/ISSN/Övrigt: ISBN: 9781557528209