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<p>Using an independently operated continuous-wave (CW) laser, we demonstrate effective frequency up-conversion detection of terahertz(THz) wave with nanosecond duration in a DAST crystal. The pump-power dependence of the terahertz up-conversion detection efficiency is investigated both theoretically and experimentally. By comparing two crystals with different heat-dissipation capabilities, the influence mechanism of heat accumulation on the up-conversion efficiency is further revealed. This approach proves the possibility of pulsed terahertz wave detection using a CW pumping without temporal alignment or phase synchronization, providing a simple and flexible scheme for terahertz detection.</p>

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Upconversion detection of terahertz wave with nanosecond pulse duration using continuous-wave laser

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月1日

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  • Naichang Liu,
  • Jiasheng Yuan,
  • Xingyu Zhang,
  • Binzhe Jiao,
  • Xutao Dai,
  • Shuzhen Fan

摘要

Using an independently operated continuous-wave (CW) laser, we demonstrate effective frequency up-conversion detection of terahertz(THz) wave with nanosecond duration in a DAST crystal. The pump-power dependence of the terahertz up-conversion detection efficiency is investigated both theoretically and experimentally. By comparing two crystals with different heat-dissipation capabilities, the influence mechanism of heat accumulation on the up-conversion efficiency is further revealed. This approach proves the possibility of pulsed terahertz wave detection using a CW pumping without temporal alignment or phase synchronization, providing a simple and flexible scheme for terahertz detection.