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A mixture of vortex terahertz radiation generation in inhomogeneous plasma by considering pump depletion

Vaziri, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1088/1555-6611/aaed36
  3. Publisher: Institute of Physics Publishing , 2019
  4. Abstract:
  5. An attempt to extend helical terahertz radiation generation based on pump depletion is presented here. By considering an upward plasma density ramp, such a reasonable extension is examined to improve the results. It is claimed that the output terahertz energy is saturated which is attributed to laser pump divergence. The saturation effect is enhanced by considering suitable laser and plasma parameters. The adjustable slope of the density ramp is an important parameter for tuning terahertz generation effciency, which is restricted to the up and down limit. For the resonant excitation of terahertz radiation, the ripple wave number is suitably chosen to satisfy the phase matching condition. Furthermore, as plasma frequency increases and approaches beat frequency, terahertz generation effciency increases. Various laser and plasma parameters are employed and we report an effciency of the order of 5 × 10 -3 for the current scheme. © 2018 Astro Ltd
  6. Keywords:
  7. Cross-focusing ; Laguerre-Gaussian beam ; Plasma density ramp ; Terahertz radiation generation ; Electromagnetic wave emission ; Gaussian beams ; Phase matching ; Plasma density ; Plasma devices ; Plasma diagnostics ; Pumping (laser) ; Inhomogeneous plasma ; Laguerre Gaussian beams ; Phase matching conditions ; Pump depletion ; Resonant excitation ; Terahertz generation ; Terahertz radiation ; Terahertz radiation generations ; Terahertz waves
  8. Source: Laser Physics ; Volume 29, Issue 1 , 2019 ; 1054660X (ISSN)
  9. URL: https://iopscience.iop.org/article/10.1088/1555-6611/aaed36