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Title: Parametric study of broadband terahertz radiation generation based on interaction of two-color ultra-short laser pulses

In this work, using a two-dimensional kinetic model based on particle in cell-Monte Carlo collision simulation method, the influence of different parameters on the broadband intense Terahertz (THz) radiation generation via application of two-color laser fields, i.e., the fundamental and second harmonic modes, is studied. These two modes are focused into the molecular oxygen (O{sub 2}) with uniform density background gaseous media and the plasma channels are created. Thus, a broadband THz pulse that is around the plasma frequency is emitted from the formed plasma channel and co-propagates with the laser pulse. For different laser pulse shapes, the THz electric field and its spectrum are both calculated. The effects of laser pulse and medium parameters, i.e., positive and negative chirp pulse, number of laser cycles in the pulse, laser pulse shape, background gas pressure, and exerted DC electric field on THz spectrum are verified. Application of a negatively chirped femtosecond (40 fs) laser pulse results in four times enhancement of the THz pulse energy (2 times in THz electric field). The emission of THz radiation is mostly observed in the forward direction.
Authors:
;  [1] ; ;  [2]
  1. Photonics Research Institute, Graduate University of Advanced Technology, Kerman (Iran, Islamic Republic of)
  2. Faculty of Physics, Shahid Bahonar University of Kerman, Kerman (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22408345
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COLOR; ELECTRIC FIELDS; INTERACTIONS; LANGMUIR FREQUENCY; LASER RADIATION; MONTE CARLO METHOD; OXYGEN; PARAMETRIC ANALYSIS; PLASMA; PULSE SHAPERS; PULSES; SPECTRA; THZ RANGE; TWO-DIMENSIONAL CALCULATIONS