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Effect of pump depletion and cross-focusing on twisted terahertz radiation generation

Sobhani, H ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1063/1.4976121
  3. Publisher: American Institute of Physics Inc , 2017
  4. Abstract:
  5. In this paper, the pump depletion and cross-focusing effects on the generation of twisted terahertz radiation are investigated. Based on the beating of two Laguerre-Gaussian lasers in a radial plasma channel, a twisted terahertz radiation can be produced. In the presence of pump depletion, the lasers power is consumed. So, the ponderomotive force nonlinearity decreases and the output terahertz field approaches to a saturation value. Under competition between the diffraction and nonlinearity effects, the amplitude of laser beam width oscillation grows. When the incident laser beams have non-similar topological charge numbers, the normalized generated terahertz amplitude is low and the pump depletion effect on the laser beam width evolution is ignorable. © 2017 Author(s)
  6. Keywords:
  7. Electromagnetic wave emission ; Gaussian beams ; Laser beam effects ; Laser beams ; Pumping (laser) ; Radiation effects ; Laguerre-Gaussian ; Nonlinearity effect ; Ponderomotive forces ; Saturation values ; Terahertz fields ; Terahertz radiation ; Terahertz radiation generations ; Topological charges ; Terahertz waves
  8. Source: Physics of Plasmas ; Volume 24, Issue 2 , 2017 ; 1070664X (ISSN)
  9. URL: https://aip.scitation.org/doi/10.1063/1.4976121