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Politics : PRESIDENT GEORGE W. BUSH -- Ignore unavailable to you. Want to Upgrade?

To: Bald Eagle who wrote (216166)	1/9/2002 2:23:55 PM
From: gao seng	Read Replies (1) \| Respond to of 769668

Is that supposing the speed of light is constant? Does this violate Einstein's equation, or is c the maximum speed of light? Storing Light In A Solid Material: Another First 07-Jan-2002 When light encounters a medium in which the index of refraction changes dramatically with wavelength, the group velocity of light -- the speed at which the wave pulse propagates -- can be considerably lowered, even to zero. The energy and information in the original light beam can be stored, without any heating, in the form of a wave of excitations in the spins of the atoms in the medium. Earlier this year, two different experiments at Harvard stopped and stored light in a vapor sample. Now the feat has been carried out in a solid at MIT and at the Air Force Research Laboratory in Hanscom, Massachusetts. This is a promising advance, since most information processing is carried out in solid-state integrated devices. The medium used, a yttrium-silicate crystal doped with atoms of the rare earth praseodymium, is already commonly used as a medium for high-density optical data storage. The researchers foresee many applications for slow or stopped light in a solid in areas such as quantum computing, ultra-sensitive magnetometry and acousto-optics (if light is slowed to subsonic speeds, strong coupling between light and sound waves becomes possible). unisci.com