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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Laser cooling in solids: advances and prospects.

Denis V Seletskiy¹, Richard Epstein, Mansoor Sheik-Bahae

¹Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA. Department of Physics and Center for Applied Photonics, University of Konstanz, Konstanz 78457, Germany.

Reports on Progress in Physics. Physical Society (Great Britain)

|August 4, 2016

Summary

Optical refrigeration removes heat from solids using anti-Stokes fluorescence. This review covers progress in cooling rare-earth solids and semiconductors, detailing models, techniques, and challenges for practical optical refrigerators.

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Area of Science:

Solid-state physics
Quantum optics
Materials science

Background:

Optical refrigeration utilizes anti-Stokes fluorescence to remove phonons from solids.
Significant advancements have been achieved in cooling rare-earth-doped solids to cryogenic temperatures.

Purpose of the Study:

To review the progress and ongoing efforts in optical refrigeration.
To examine the underlying principles, experimental techniques, and challenges associated with optical refrigeration.

Main Methods:

Detailed analysis of a four-level model for rare-earth-based optical refrigeration.
Description of experimental techniques, including resonant and non-resonant optical cavities.
Examination of laser cooling in semiconductors, contrasting with rare-earth systems.

Main Results:

Success in achieving cryogenic temperatures in rare-earth-doped solids.
Elucidation of material parameter roles in optical refrigeration efficiency.
Observed optical refrigeration in CdS nanostructures, highlighting semiconductor potential.

Conclusions:

Optical refrigeration offers a promising pathway for advanced cooling technologies.
Engineering challenges remain for the development of practical optical refrigerators.
Semiconductors present new opportunities and challenges for laser cooling applications.