TITLE:
Efficiency Analysis of Terahertz Radiation Produced under Different Pumping Conditions of Two Femtosecond Laser Pulses
AUTHORS:
Abdelrahman I. Mahdy, Hoda A. Eltayeb
KEYWORDS:
High-Order FDTD, Maxwells Equations Solver, Terahertz Radiation Production, Filamentation of Femtosecond Laser, Kerr Nonlinearity
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.13 No.7,
July
4,
2025
ABSTRACT: We analyzed the efficiency of a terahertz radiation produced at different pumping conditions of a first harmonic (ω0) Gaussian beam coupled with a second harmonic (2ω0) Laguerre-Gaussian vortex beam. In particular, we investigated the spatial-temporal properties of an induced THz vortex beam under an equal and unequal beams amplitudes filamentation conditions, and in different input intensity regions for each condition. In this respect, for every single filamentation condition, we numerically simulated the transverse intensity distribution and the phase-azimuthal angle modulation of the produced THz vortex beam in each given intensity region. Numerical results have justified that the generated THz vortex beam-shape is mainly the filamentation condition dependence, meanwhile the spatial-temporal properties of the induced beam are constrained to the input intensity region. On the whole, regardless of the filamentation condition, in the high-input intensity region more efficient largely anisotropic THz vortex beam with more refinement intensity and highly orbital angular momentum acceleration is demonstrated.