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<p>THz generation from chirped and delayed laser pulses using periodically poled lithium niobate (PPLN) traditionally requires high-energy sources and bulky PPLN crystals. However, for compact, integrated, and miniaturized THz-based applications, such systems must be downsized. In this work, we numerically and experimentally demonstrate THz generation in a PPLN waveguide with a cross-section of 500 × 500 µm<sup>2</sup>, pumped with low pulse energies in the microjoule range at a wavelength of 1&#xa0;µm. Simulations show that tightly focused optical pulses in this configuration achieve significantly higher THz generation efficiency compared to collimated pumping. For a propagation length of 1.6&#xa0;cm, optimal parameters are identified as a pulse duration of 5&#xa0;ps and a pump energy between 0.5 and 1&#xa0;µJ. Experimental validation confirms these findings, yielding a narrowband THz spectrum centered around 488&#xa0;GHz. This work opens new perspectives for the development of efficient, integrated THz sources for advanced applications in THz photonics, spectroscopy, and high-speed communications.</p>

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Terahertz generation from chirped and delayed laser pulses in a periodically poled lithium niobate waveguide

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Ilyes Betka,
  • Moise Deroh,
  • Simon Dubuis,
  • Gabriel Taton,
  • Frédéric Fauquet,
  • Moses Eshovo Ojo,
  • Coralie Fourcade-Dutin,
  • Hervé Maillotte,
  • Vincent Rodriguez,
  • Mathieu Chauvet,
  • Patrick Mounaix,
  • Damien Bigourd

摘要

THz generation from chirped and delayed laser pulses using periodically poled lithium niobate (PPLN) traditionally requires high-energy sources and bulky PPLN crystals. However, for compact, integrated, and miniaturized THz-based applications, such systems must be downsized. In this work, we numerically and experimentally demonstrate THz generation in a PPLN waveguide with a cross-section of 500 × 500 µm2, pumped with low pulse energies in the microjoule range at a wavelength of 1 µm. Simulations show that tightly focused optical pulses in this configuration achieve significantly higher THz generation efficiency compared to collimated pumping. For a propagation length of 1.6 cm, optimal parameters are identified as a pulse duration of 5 ps and a pump energy between 0.5 and 1 µJ. Experimental validation confirms these findings, yielding a narrowband THz spectrum centered around 488 GHz. This work opens new perspectives for the development of efficient, integrated THz sources for advanced applications in THz photonics, spectroscopy, and high-speed communications.