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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Laser cooling without spontaneous emission.

Christopher Corder¹, Brian Arnold¹, Harold Metcalf¹

¹Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA.

Physical Review Letters

|February 14, 2015

Summary

Laser cooling without spontaneous emission was demonstrated by minimizing atom-light interaction time. This technique significantly reduces atomic temperature and limits spatial expansion, offering new possibilities for laser cooling applications.

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Area of Science:

Atomic, Molecular, and Optical (AMO) Physics
Quantum Optics

Background:

Spontaneous emission is a fundamental process in laser cooling.
Minimizing spontaneous emission has been a long-standing challenge in the field.

Purpose of the Study:

To demonstrate laser cooling without spontaneous emission.
To address a significant controversy regarding the necessity of spontaneous emission for laser cooling.

Main Methods:

Utilizing the bichromatic force on an atomic transition.
Ensuring atom-light interaction time is short compared to the natural decay cycle.
Selecting an atomic transition with a long excited state lifetime and short cooling time.

Main Results:

Achieved laser cooling with significantly minimized spontaneous emission.

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Last Updated: Apr 17, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

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Published on: August 1, 2017

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Reduced the observed one-dimensional velocity distribution width by a factor of 2.

Decreased the effective temperature of the atomic sample by a factor of 4.

Observed phase space compression by limiting spatial expansion.

Conclusions:

Demonstrated a novel laser cooling method that bypasses spontaneous emission.
The technique offers a new approach for laser cooling, especially in constrained environments.
Results have implications for direct laser cooling of molecules and experiments with limited space or time.