In a nod to scientific paradox, researchers at the University of California, Berkeley, have slowed light down in an effort to speed up network communication.
They have shown for the first time that the group velocity of light - the speed at which a laser pulse travels along a light wave - can be slowed to about 6 miles per second in semiconductors. While that speed is not exactly the pace of a turtle, it is 31,000 times slower than the 186,000 miles (or 300 million meters) per second that light normally clocks while traveling through a vacuum.
"Its about twice as fast as an orbiting space shuttle," said Connie J. Chang-Hasnain, UC Berkeley professor of electrical engineering and computer science and principal investigator of the project. "This achievement marks a major milestone on the road to ever faster optical networks and higher performance communications."
Sarah Yang | EurekAlert!
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The quality of additively manufactured components depends not only on the manufacturing process, but also on the inline process control. The process control ensures a reliable coating process because it detects deviations from the target geometry immediately. At LASER World of PHOTONICS 2019, the Fraunhofer Institute for Laser Technology ILT will be demonstrating how well bi-directional sensor technology can already be used for Laser Material Deposition (LMD) in combination with commercial optics at booth A2.431.
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Researchers at TU Graz calculate the most accurate gravity field determination of the Earth using 1.16 billion satellite measurements. This yields valuable knowledge for climate research.
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