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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Decade-spanning high-precision terahertz frequency comb.

Ian A Finneran1, Jacob T Good1, Daniel B Holland1

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

Physical Review Letters
|May 9, 2015
PubMed
Summary
This summary is machine-generated.

Researchers generated a broad terahertz (THz) frequency comb using femtosecond lasers and asynchronous optical sampling. This advancement enables highly accurate measurements of water vapor transitions in the THz range.

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Area of Science:

  • Physics
  • Spectroscopy
  • Quantum Optics

Background:

  • Terahertz (THz) frequency combs are crucial for high-precision spectroscopy.
  • Generating broad bandwidth and high-resolution THz combs has been a significant challenge.

Purpose of the Study:

  • To report the generation and detection of a decade-spanning THz frequency comb.
  • To demonstrate its application in precise spectroscopic measurements of water vapor.

Main Methods:

  • Utilized two Ti:sapphire femtosecond laser oscillators.
  • Employed asynchronous optical sampling THz time-domain spectroscopy.
  • Measured water vapor transitions between 1-2 THz at 10 mTorr.

Main Results:

  • Generated a THz frequency comb spanning 0.15–2.4 THz.
  • Achieved a tooth spacing of 80 MHz, linewidth of 3.7 kHz, and fractional precision of 1.8×10⁻⁹.
  • Measured three water vapor transitions with an average Doppler-limited fractional accuracy of 6.1×10⁻⁸.

Conclusions:

  • Demonstrated a robust method for generating a wideband, high-resolution THz frequency comb.
  • Showcased the potential for significant improvements in bandwidth, resolution, and sensitivity using existing technologies.
  • Opened avenues for advanced THz spectroscopy applications.