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Area of Science:

  • Physics
  • Spectroscopy
  • Quantum Optics

Background:

  • Optical frequency combs revolutionized metrology by linking microwave and optical frequencies.
  • Extreme-ultraviolet (XUV) frequency combs were generated via high-harmonic generation but lacked sufficient power and coherence.
  • Previous XUV combs were too weak for detailed spectroscopic applications or observing phase coherence.

Purpose of the Study:

  • To generate powerful XUV frequency combs for advanced spectroscopic applications.
  • To demonstrate the coherence of XUV frequency combs in the extreme ultraviolet spectral range.
  • To extend ultrahigh-precision spectroscopy to wavelengths below 100 nanometers.

Main Methods:

  • Coupling a high-power near-infrared frequency comb to a femtosecond enhancement cavity.
  • Generating XUV frequency combs reaching wavelengths as short as 40 nanometers.
  • Performing single-photon spectroscopy on argon and neon transitions.

Main Results:

  • Generation of powerful XUV frequency combs (down to 40 nm).
  • Observation of single-photon spectroscopy signals for argon (82 nm) and neon (63 nm) transitions, confirming XUV comb coherence.
  • Determination of the absolute frequency of an argon transition (82 nm) with unprecedented precision.

Conclusions:

  • The generated XUV frequency combs are powerful and coherent, suitable for high-precision spectroscopy.
  • This technology enables spectroscopy below 100 nm, a region inaccessible to continuous-wave lasers.
  • XUV frequency combs offer significant potential for applications in molecular spectroscopy, fundamental physics tests, and advanced clocks.