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<p>The problem of generating single-mode terahertz pulsed radiation via optical rectification of a femtosecond laser pulse (Ti:Sapphire) in a nonlinear crystal partially filling a parallel-plate waveguide is addressed. A numerical analysis of the mode composition and terahertz pulse transmission in this structure is performed. It is demonstrated that single-mode coupling between the linearly polarized optical excitation pulse focused on the LiNbO<sub>3</sub> crystal and the terahertz pulse can be achieved in a broad spectral range of 0.1–2.5 THz. The study shows that efficient generation and single-mode transmission of the terahertz pulse with minimum attenuation can be achieved by optimally selecting the sizes and permittivity of the nonlinear crystal, along with the waveguide sizes. The results are compared with both experimental and numerical data for a rectangular metal waveguide partially filled with an optically nonlinear crystal.</p>

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Terahertz Radiation in a Parallel Metal Plate Waveguide Partially Filled with a Nonlinear Optical Crystal

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • A. S. Nikoghosyan,
  • V. R. Tadevosyan

摘要

The problem of generating single-mode terahertz pulsed radiation via optical rectification of a femtosecond laser pulse (Ti:Sapphire) in a nonlinear crystal partially filling a parallel-plate waveguide is addressed. A numerical analysis of the mode composition and terahertz pulse transmission in this structure is performed. It is demonstrated that single-mode coupling between the linearly polarized optical excitation pulse focused on the LiNbO3 crystal and the terahertz pulse can be achieved in a broad spectral range of 0.1–2.5 THz. The study shows that efficient generation and single-mode transmission of the terahertz pulse with minimum attenuation can be achieved by optimally selecting the sizes and permittivity of the nonlinear crystal, along with the waveguide sizes. The results are compared with both experimental and numerical data for a rectangular metal waveguide partially filled with an optically nonlinear crystal.