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Area of Science:

  • Physics
  • Spectroscopy
  • Optical Engineering

Background:

  • Optical frequency combs offer broadband spectroscopy with frequency markers traceable to microwave standards.
  • Discrete mode distribution in combs limits spectral sampling to mode spacing, hindering high-resolution analysis.

Purpose of the Study:

  • To overcome the limitations of discrete mode spacing in optical frequency combs for terahertz (THz) spectroscopy.
  • To achieve a spectral sampling interval comparable to the mode linewidth, enhancing spectral resolution and accuracy.

Main Methods:

  • Implemented spectral interleaving combined with dual-comb spectroscopy in the THz region.
  • Achieved spectrally interleaved THz combs by sweeping laser repetition frequency and adding frequency marks.

Main Results:

  • Attained a spectral sampling interval equal to the mode linewidth, not the mode spacing.
  • Demonstrated an improved spectral sampling density of 2.5 MHz in low-pressure gas spectroscopy.
  • Achieved enhanced spectral accuracy of 8.39 × 10⁻⁷ in the THz region.

Conclusions:

  • The proposed method enables simultaneous high resolution, high accuracy, and broad spectral coverage in THz spectroscopy.
  • This technique significantly advances capabilities for analyzing gases in the THz spectral range.