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Related Experiment Video

Updated: Jun 8, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

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Published on: March 30, 2017

Doppler cooling a microsphere.

P F Barker1

  • 1Department of Physics and Astronomy, University College London, WC1E 6BT, United Kingdom.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate Doppler cooling of optically levitated microspheres using light scattering. This technique cools the sphere's motion, analogous to atomic cooling, with potential applications in precision measurements.

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Last Updated: Jun 8, 2026

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08:06

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Published on: June 2, 2017

Area of Science:

  • Optics and Photonics
  • Quantum Optics
  • Nanotechnology

Background:

  • Optical tweezers are used to trap and manipulate microscopic objects.
  • Whispering gallery mode (WGM) resonances in microspheres offer unique light-matter interaction properties.
  • Doppler cooling is a well-established technique for reducing the motion of atoms.

Purpose of the Study:

  • To describe a method for Doppler cooling the center-of-mass motion of optically levitated microspheres.
  • To investigate the use of velocity-dependent scattering force from WGM resonances for cooling.
  • To explore the potential of this technique for precision measurements and quantum technologies.

Main Methods:

  • Optically levitating a silica microsphere (20 μm diameter) within optical tweezers.
  • Utilizing red-detuned light from narrow WGM resonances to induce a velocity-dependent scattering force.
  • Analyzing the cooling dynamics and calculating cooling times based on incident power.

Main Results:

  • Demonstrated Doppler cooling of the microsphere's center-of-mass motion.
  • The scattering force is not limited by saturation and can be controlled by incident laser power.
  • Calculated cooling times on the order of seconds for the levitated microsphere.

Conclusions:

  • Doppler cooling of optically levitated microspheres is achievable via WGM resonances.
  • This method offers a controllable and potentially efficient way to cool micro-objects.
  • The technique holds promise for applications requiring ultra-low motion states of levitated particles.