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Martínez, P.G.D.A. [Author]; Babushkin, I. [Author]; Bergé, L. [Author]; Skupin, S. [Author]; Cabrera-Granado, E. [Author]; Köhler, C. [Author]; Morgner, Uwe [Author]; Husakou, A. [Author]; Herrmann, J. [Author]

Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape - [published Version]

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  • Media type: E-Article; Text
  • Title: Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape
  • Contributor: Martínez, P.G.D.A. [Author]; Babushkin, I. [Author]; Bergé, L. [Author]; Skupin, S. [Author]; Cabrera-Granado, E. [Author]; Köhler, C. [Author]; Morgner, Uwe [Author]; Husakou, A. [Author]; Herrmann, J. [Author]
  • imprint: American Physical Society, 2015
  • Published in: Physical Review Letters 114 (2015), Nr. 18
  • Issue: published Version
  • Language: English
  • DOI: https://doi.org/10.15488/3292; https://doi.org/10.1103/PhysRevLett.114.183901
  • ISSN: 0031-9007
  • Keywords: Inert gases ; Plasma generation ; Analytical studies ; Terahertz waves ; Drift velocities ; Propagation effect ; Ionization of gases ; Tunnel ionization ; Electrons ; Current modeling ; Multiple frequency ; Ionization ; Terahertz generation
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  • Description: Broadband ultrashort terahertz (THz) pulses can be produced using plasma generation in a noble gas ionized by femtosecond two-color pulses. Here we demonstrate that, by using multiple-frequency laser pulses, one can obtain a waveform which optimizes the free electron trajectories in such a way that they acquire the largest drift velocity. This allows us to increase the THz conversion efficiency to 2%, an unprecedented performance for THz generation in gases. In addition to the analytical study of THz generation using a local current model, we perform comprehensive 3D simulations accounting for propagation effects which confirm this prediction. Our results show that THz conversion via tunnel ionization can be greatly improved with well-designed multicolor pulses. © 2015 American Physical Society.
  • Access State: Open Access