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Compact and portable terahertz source by mixing two frequencies generated simultaneously by a single solid-state

Pu Zhao1, Srinivasa Ragam, Yujie J Ding

  • 1Department of Electrical and Computer Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA.

Optics Letters
|December 3, 2010
PubMed
Summary

We developed a compact terahertz (THz) source using GaSe crystals and a specialized laser. This portable system efficiently generates THz waves for various applications.

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Area of Science:

  • Optics and Photonics
  • Solid-State Physics
  • Terahertz Science and Technology

Background:

  • Terahertz (THz) radiation offers unique properties for spectroscopy, imaging, and sensing.
  • Developing compact and portable THz sources remains a key challenge in the field.
  • Difference-frequency generation (DFG) is a promising nonlinear optical technique for THz generation.

Purpose of the Study:

  • To demonstrate a compact and portable terahertz (THz) source.
  • To utilize difference-frequency generation (DFG) in a Gallium Selenide (GaSe) crystal for THz wave generation.
  • To integrate the THz source components into a portable system.

Main Methods:

  • Employed difference-frequency generation (DFG) in a GaSe nonlinear crystal.
  • Utilized a single Q-switched Neodymium-doped Yttrium Lithium Fluoride (Nd:YLF) laser with two resonators to generate dual input frequencies.

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  • Characterized the generated THz output power, frequency, and linewidth.

    • Main Results:

    • Achieved a compact and portable terahertz (THz) source.
    • Generated THz output at an average power of 1 μW at a frequency of 1.64 THz (corresponding to a wavelength of 182 μm).
    • Observed a spectral linewidth of 65 GHz for the generated THz radiation.

    Conclusions:

    • The demonstrated THz source is compact and portable, suitable for field applications.
    • The use of DFG in GaSe with a dual-resonator laser provides an efficient method for THz generation.
    • This portable THz source opens possibilities for advanced THz spectroscopy and imaging systems.