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

W.-M. Wang, Z.-M. Sheng, Y.-T. Li, Y. Zhang, and J. Zhang
Phys. Rev. A 96, 023844 – Published 21 August 2017

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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  • Received 14 April 2017

DOI:https://doi.org/10.1103/PhysRevA.96.023844

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalPlasma Physics

Authors & Affiliations

W.-M. Wang1,2,5,*, Z.-M. Sheng3,4,5, Y.-T. Li1,5,6, Y. Zhang2, and J. Zhang3,5

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China
  • 2Beijing Advanced Innovation Center for Imaging Technology and Key Laboratory of Terahertz Optoelectronics (MoE), Department of Physics, Capital Normal University, Beijing 100048, China
  • 3Key Laboratory for Laser Plasmas (MoE) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 4SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom
  • 5IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
  • 6School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

  • *weiminwang1@126.com

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Issue

Vol. 96, Iss. 2 — August 2017

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