An infrared picture shows the change in temperature for laser-cooled gas (blue) and a surrounding metal chamber (red and yellow). After a 30-second pulse from a special type of laser beam, the gas cooled by several degrees compared to its container. Picture courtesy Martin WeitzFrom National Geographic:
Laser beams are best known as weapons in science fiction and as heating and cutting tools in science fact. But a new study has flip-flopped conventional physics to show lasers in a whole new light.
In a new technique, Martin Weitz and Ulrich Vogl of the University of Bonn in Germany used a laser to bring the temperature of dense rubidium gas far below the normal point at which the gas becomes a solid.
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