Light stopped for over a second
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Light has been stopped in its tracks for more than one second, setting a new record over a thousand times longer than the previous one. Researchers at the Australian National University used a technique called electromagnetically induced transparency in which a beam of laser light puts the atoms in a solid sample into a state in which a signal light pulse can be trapped. Most previous stopped-light demonstrations have used gases rather than solid materials. Light had previously been stopped in a solid (yttrium-silicate doped with atoms of pra
Light has been stopped in its tracks for more than one second, setting a new record over a thousand times longer than the previous one.
Researchers at the Australian National University used a technique called electromagnetically induced transparency in which a beam of laser light puts the atoms in a solid sample into a state in which a signal light pulse can be trapped.
Most previous stopped-light demonstrations have used gases rather than solid materials. Light had previously been stopped in a solid (yttrium-silicate doped with atoms of praseodymium), but only for a few milliseconds.
Although the efficiency of the storage was low in this experiment, the researchers believe they can improve the efficiency by using a thicker sample and by increasing the concentration of praseodymium in the sample. The technique could be useful in quantum information processing applications such as quantum computers.
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Read the source: Wikinews ↗Source published 14 Sept 2005, 05:30 am IST
