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Physics World

Awards: Laser-cooled Nobel prize

Alison Goddard

Published Nov 1, 1997• 0 citations
Publisher

Abstract

Winning the Nobel prize for physics is like being hit by a tornado, according to one of this year's laureates. "I just wish it would stop so that I could go back to work," says Claude Cohen-Tannoudji of the Collège de France and the Ecole Normale Supérieure in Paris. He shares the 1997 prize with Steve Chu of Stanford University in California and Bill Phillips of the National Institute of Standards and Technology in Gaithersburg, Maryland, for developing techniques to cool and trap atoms at extremely low temperatures using lasers.

DOI
10.1088/2058-7058/10/11/6

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Winning the Nobel prize for physics is like being hit by a tornado, according to one of this year's laureates. "I just wish it would stop so that I could go back to work," says Claude Cohen-Tannoudji of the Collège de France and the Ecole Normale Supérieure in Paris. He shares the 1997 prize with Steve Chu of Stanford University in California and Bill Phillips of the National Institute of Standards and Technology in Gaithersburg, Maryland, for developing techniques to cool and trap atoms at extremely low temperatures using lasers.
NOBEL PRIZESPhysicists nowadays can cool, trap, bounce, and toss atoms with the facility of microscopic jugglers. That facility is due in no small part to techniques developed by three masters of atomic manipulation--Steven Chu of Stanford University, Claude Cohen-Tannoudji of the A‰cole Normale SupA©rieure in Paris, and William Phillips of the National Institute of Standards and Technology in Gaithersburg, Maryland--who have been awarded the 1997 Nobel Prize in physics. Over the last decade, they showed how atoms could be chilled to millionths of a degree above absolute zero and trapped by bombarding them with beams of laser light. The work has proved invaluable for basic physics and has also led to dozens of applications. For more information on this prize, see the [Nobel Foundation Web site][1]. [1]: http://www.nobel.se/announcement-97/physics97.html
The past few years have seen remarkable developments in the ability to control atomic motion by optical techniques. Among the key tools that have been developed for this purpose are the techniques of laser cooling, the significance of which was recognized by the award of the 1997 Nobel Prize in Physics to Steven Chu, Claude Cohen-Tannoudji, and William Phillips. These techniques have made it possible to cool atoms to temperatures lower than have been produced in any other physical system - around 10(-8) degrees Kelvin above absolute zero - and to confine those in traps for extended periods of observation.
Forty years ago, twenty years after the discovery of the laser, physicists were developing laser cooling methods for ions trapped in electromagnetic fields.From the 1980s onwards, these techniques were refined and extended to atoms, thanks to the audacity and inventiveness of a generation of pioneering researchers.Actually, it was necessary to succeed simultaneously in trapping and cooling samples of atomic gases in a vacuum at a distance from any wall.Spectacular results followed and extraordinarily low temperatures were quickly reached, very close to absolute zero.The field of "cold atoms" was born, rewarded by successive Nobel prizes, first of which was awarded in 1997 to William D. Phillips, Steven Chu and Claude Cohen-Tannoudji, last in 2022 to Alain Aspect.Gaseous samples of a few thousand to a few billion atoms can be prepared at a few millionths of a degree above absolute zero, which means that the particles move at extremely low speed, of the order of centimetres per second.At these extreme temperatures, the behaviour of matter changes and its properties can only be described using quantum mechanics and the wave properties of particles.New physical phenomena have been discovered and innovations have followed the theoretical and experimental progress of the research.Initially imagined as a wonderful method for perfecting atomic physics, cold atoms have gradually proved to be powerful tools for research in cross-cutting fields of physics, such as condensed matter and even high-energy physics.These atoms are now referred to as 'quantum gases' at such low temperatures that their collective behaviour is modified by the laws of quantum mechanics.
Of the many application of lasers, the one with possibly the most dramatic impact on fundamental physics is laser cooling and trapping: the Nobel Prize for physics was awarded for laser cooling in 1997 [1]. The staggering progress achieved by laser cooling is reflected by considering a thought experiment that begins ‘take an atom. . . ’. Such an experiment was impossible to realize in practice because room temperature atoms move at supersonic speeds and, as atoms are neutral, there was no easy way to grab hold of them. Laser cooling allows one to obtain samples of atoms essentially at rest, with temperatures in the microKelvin region being routine. At such low temperatures, it becomes easy to trap or move atoms with modest electromagnetic forces [2, 3] and a whole new class of experiments previously confined to the realm of fantasy becomes possible. For example, one can throw atoms upwards and use precision spectroscopy to measure time or gravity with unprecedented accuracy. One can place atoms at a desired location on a surface creating a novel lithographic technique or place an atom just above the surface to create a qubit in a quantum information processor. One can take many atoms and cool them further by evaporation to form a Bose-Einstein condensate [4] or degenerate Fermi gas. This last development has propelled atomic and optical physics right into the heart of condensed matter physics and resulted in the award of the Nobel Prize in 2001.
Of the many applications of lasers, the one with possibly the most dramatic impact on fundamental physics is laser cooling and trapping: the Nobel Prize for physics was awarded for laser cooling in 1997. Laser cooling allows one to obtain samples of atoms essentially at rest, with temperatures in the micro-Kelvin region being routine. At such low temperatures, it becomes easy to trap or move atoms with modest electromagnetic forces and a whole new class of experiments previously confined to the realm of fantasy becomes possible. The high brightness of masers and lasers makes it possible to access a regime of atomic excitation for which Einstein’s rate equations are inadequate. Three-dimensional optical molasses using counter-propagating laser beams along three mutually orthogonal directions was first observed in 1985 by Chu et al. The Sisyphus mechanism works well for atoms that are already cold and has a smaller capture velocity than conventional Doppler cooling.