Terahertz emission driven by two-color laser pulses at various frequency ratios

W.-M Wang, Z.-M Sheng, Y.-T Li, Y. Zhang, J. Zhang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We present a simulation study of terahertz radiation from a gas driven by two-color laser pulses in a broad range of frequency ratios ω1/ω0. Our particle-in-cell simulation results show that there are three series with ω1/ω0=2n, n+1/2, n±1/3 (n is a positive integer) for high-efficiency and stable radiation generation. The radiation strength basically decreases with the increasing ω1 and scales linearly with the laser wavelength. These rules are broken when ω1/ω0<1 and much stronger radiation may be generated at any ω1/ω0. These results can be explained with a model based on gas ionization by two linear-superposition laser fields, rather than a multiwave mixing model.
LanguageEnglish
Article number023844
Number of pages8
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume96
Issue number2
DOIs
Publication statusPublished - 21 Aug 2017

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color
radiation
pulses
lasers
gas ionization
integers
simulation
cells
gases
wavelengths

Keywords

  • terahertz radiation
  • laser pulses
  • laser wavelength

Cite this

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abstract = "We present a simulation study of terahertz radiation from a gas driven by two-color laser pulses in a broad range of frequency ratios ω1/ω0. Our particle-in-cell simulation results show that there are three series with ω1/ω0=2n, n+1/2, n±1/3 (n is a positive integer) for high-efficiency and stable radiation generation. The radiation strength basically decreases with the increasing ω1 and scales linearly with the laser wavelength. These rules are broken when ω1/ω0<1 and much stronger radiation may be generated at any ω1/ω0. These results can be explained with a model based on gas ionization by two linear-superposition laser fields, rather than a multiwave mixing model.",
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Terahertz emission driven by two-color laser pulses at various frequency ratios. / Wang, W.-M; Sheng, Z.-M; Li, Y.-T; Zhang, Y.; Zhang, J.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 96, No. 2, 023844, 21.08.2017.

Research output: Contribution to journalArticle

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T1 - Terahertz emission driven by two-color laser pulses at various frequency ratios

AU - Wang, W.-M

AU - Sheng, Z.-M

AU - Li, Y.-T

AU - Zhang, Y.

AU - Zhang, J.

PY - 2017/8/21

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AB - We present a simulation study of terahertz radiation from a gas driven by two-color laser pulses in a broad range of frequency ratios ω1/ω0. Our particle-in-cell simulation results show that there are three series with ω1/ω0=2n, n+1/2, n±1/3 (n is a positive integer) for high-efficiency and stable radiation generation. The radiation strength basically decreases with the increasing ω1 and scales linearly with the laser wavelength. These rules are broken when ω1/ω0<1 and much stronger radiation may be generated at any ω1/ω0. These results can be explained with a model based on gas ionization by two linear-superposition laser fields, rather than a multiwave mixing model.

KW - terahertz radiation

KW - laser pulses

KW - laser wavelength

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