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Laser-induced thermal source for cold atoms.

Chung Chuan Hsu1, Rémy Larue2,3, Chang Chi Kwong4,5

  • 1School of Physical and Mathematical Science, Nanyang Technological University, Singapore, 637371, Singapore.

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We developed a new laser-induced thermal ablation (LITA) method for laser cooling and trapping atoms. This technique efficiently cools strontium atoms, achieving millions of cold atoms for quantum technology applications.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Technologies
  • Laser Physics

Background:

  • Achieving ultra-high vacuum is crucial for long trapping lifetimes of cold atoms.
  • Traditional atomic cooling methods can be complex and require specialized setups.
  • Laser-induced thermal ablation (LITA) offers a novel approach to atom trapping.

Purpose of the Study:

  • To demonstrate a simple and compact laser cooling and trapping technique using LITA.
  • To achieve a proof-of-concept for magneto-optical trapping of strontium atoms via LITA.
  • To explore the potential of LITA for various atomic species and quantum applications.

Main Methods:

  • Utilizing laser-induced thermal ablation (LITA) of a solid strontium granule to generate atomic vapor.
  • Implementing a magneto-optical trap (MOT) on the strontium 461 nm transition.
  • Employing an original permanent magnet configuration for the MOT's quadrupole magnetic field.
  • Rapid thermalization of the granule for fast ultra-high vacuum recovery.

Main Results:

  • Successfully trapped up to 3.5 million cold strontium-88 atoms.
  • Achieved a trapping lifetime exceeding 4 seconds, limited by background vapor pressure.
  • Demonstrated the feasibility of LITA for creating cold atomic samples.

Conclusions:

  • LITA provides a simple, compact, and effective method for laser cooling and trapping atoms.
  • The technique shows promise for various atomic elements, including transition metals and lanthanides.
  • LITA has strong potential for applications in quantum computing and precision measurements, such as outdoor inertial sensing.