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Doppler Cooling Trapped Ions with a UV Frequency Comb.

Josue Davila-Rodriguez1, Akira Ozawa1, Theodor W Hänsch1

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Frequency combs enable Doppler cooling of trapped magnesium ions to near the Doppler limit. This technique broadens laser cooling applications to new atomic species and spectral regions.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Laser Spectroscopy

Background:

  • Doppler cooling is a fundamental technique for reducing ion temperature.
  • Laser cooling typically requires precisely tuned lasers, limiting accessible atomic species.
  • Frequency combs offer a novel approach to laser cooling with broad bandwidth.

Purpose of the Study:

  • To demonstrate Doppler cooling of magnesium ions using a frequency comb.
  • To investigate the cooling and heating dynamics of ions subjected to frequency comb light.
  • To assess the potential of frequency comb cooling for expanding laser cooling applications.

Main Methods:

  • Trapping of magnesium ions in a standard ion trap.
  • Generation of a 280 nm frequency comb via frequency tripling of a Ti:sapphire laser.
  • Application of the frequency comb to the magnesium ion's 3s_{1/2}-3p_{3/2} transition.
  • Spatial thermometry to measure ion temperature.

Main Results:

  • Successful Doppler cooling of magnesium ions to near the Doppler limit was achieved.
  • A specific comb line facilitated cooling, while a nearby blue-detuned line caused negligible heating.
  • Long-term cooling of ion chains, including sympathetically cooled ions, was observed.
  • The cooling-heating transition was clearly identified.

Conclusions:

  • Frequency comb laser cooling is a viable technique for magnesium ions.
  • This method demonstrates potential for cooling ions near the Doppler limit.
  • Frequency combs can expand laser cooling capabilities to new atomic species and spectral ranges, including the vacuum ultraviolet.