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laser cooling
(redirected from Optical molasses)

    Also found in: Encyclopedia, Wikipedia 0.01 sec.
laser cooling
n.
The slowing down of atoms or molecules by the use of a laser whose frequency has been adjusted to remove momentum from the particles.
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The MOT can achieve higher atom density, but the ball of atoms is typically converted to optical molasses prior to launching.
Primary atomic frequency standards at NIST by Wineland, D.J. / Journal of Research of the National Institute of Standards and Technology
By converting the slowest atoms in the optical molasses into a "dark" state, in which they no longer absorb photons, the team was able to chill helium atoms to a mere 180 billionths of a degree above absolute zero, where the atoms moved at the terrapinlike pace of 2 cm/s.
Laser cooling yields Nobel in physics by Perkins, Sid / Science News
In a typical experiment, the optical molasses has a volume of 1 cubic centimeter and contains about 10 million atoms moving at an average speed of 10 centimeters per second, a five-thousandth of their speed at room temperature.
Optical molasses: atoms in the deep freeze by Peterson, Ivars / Science News
 
 
 
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