Chirp-control of resonant high-order harmonic generation in indium ablation plumes driven by intense few-cycle laser pulses

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Title: Chirp-control of resonant high-order harmonic generation in indium ablation plumes driven by intense few-cycle laser pulses
Authors: Tisch, JWG
Abdelrahman, Z
Khokhlova, M
Walke, D
Witting, T
Zair, A
Strelkov, V
Marangos, J
Item Type: Journal Article
Abstract: We have studied high-order harmonic generation (HHG) in an indium ablation plume driven by intense few-cycle laser pulses centered at 775 nm as a function of the frequency chirp of the laser pulse. We found experimentally that resonant emission lines between 19.7 eV and 22.3 eV (close to the 13th and 15th harmonic of the laser) exhibit a strong, asymmetric chirp dependence, with pronounced intensity modulations. The chirp dependence is reproduced by our numerical time-dependent Schrödinger equation simulations of a resonant HHG by the model indium ion. As demonstrated with our separate simulations of HHG within the strong field approximation, the resonance can be understood in terms of the chirp-dependent HHG photon energy coinciding with the energy of an autoionizing state to ground state transition with high oscillator strength. This supports the validity of the general theory of resonant four-step HHG in the few-cycle limit.
Issue Date: 11-Jun-2018
Date of Acceptance: 10-May-2018
ISSN: 1094-4087
Publisher: Optical Society of America (OSA)
Start Page: 15745
End Page: 15758
Journal / Book Title: Optics Express
Volume: 26
Issue: 12
Copyright Statement: © 2018 The Author(s). Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/I032517/1
Keywords: 0205 Optical Physics
1005 Communications Technologies
0906 Electrical And Electronic Engineering
Publication Status: Published
Online Publication Date: 2018-06-07
Appears in Collections:Quantum Optics and Laser Science
Faculty of Natural Sciences

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