ความคิดเห็นที่ 4
ได้ข้อมูลแล้วครับ
คนทำชื่อ Lene Hau กับทีมงานครับ ทดลองมา 4 ปีกว่าๆพึ่งจะสำเร็จครับ
หลักการของเครื่องที่ว่านี่ก็คือ ทำให้อะตอมมันเข้ามาอยู่ใกล้กันให้มากที่สุด โดยยิงแสงผ่านเครื่องมือที่มีคุณสมบัติดังนี้ครับ
1.อุณหภูมิต้องต่ำมากๆ
2.ต้องมีความเป็นสุญญากาศสูง
ด้วยวิธีที่ว่านี้ จะทำให้ความเร็วแสง จากโลกไปดวงจันทร์ 240,000 miles ในสองวินาที เหลือเพียง 38 miles ต่อชั่วโมง
ข้อมูลเต็มๆลองอ่านดูครับ
Light, which normally travels the 240,000 miles from the Moon to Earth in less than two seconds, has been slowed to the speed of a minivan in rush-hour traffic -- 38 miles an hour.
An entirely new state of matter, first observed four years ago, has made this possible. When atoms become packed super-closely together at super-low temperatures and super-high vacuum, they lose their identity as individual particles and act like a single super- atom with characteristics similar to a laser.
Such an exotic medium can be engineered to slow a light beam 20 million-fold from 186,282 miles a second to a pokey 38 miles an hour.
"In this odd state of matter, light takes on a more human dimension; you can almost touch it," says Lene Hau, a Harvard University physicist.
Hau led a team of scientists who did this experiment at the Rowland Institute for Science, a private, nonprofit research facility in Cambridge, Mass., endowed by Edwin Land, the inventor of instant photography.
In the future, slowing light could have a number of practical consequences, including the potential to send data, sound, and pictures in less space and with less power. Also, the results obtained by Hau's experiment might be used to create new types of laser projection systems and night vision cameras with power requirements a million times less than what is presently possible.
But that's not why Hau, a research scientist at both Harvard and the Rowland Institute, originally set out to do the experiments. "We did them because we are curious about this new state of matter," she says. "We wanted to understand it, to discover all the things that can be done with it."
It took Hau and three colleagues several years to make a container of the new matter. Then followed a series of 27-hour-long trial runs to get all the parts and parameters working together.
"So many things have to go right," Hau comments. "But the results finally exceeded our expectations. It's fascinating to see a beam of light almost come to a standstill."
Lene Hau, Zachary Dutton, and Cyrus Behroozi (from left to right) stand by the equipment they used to create the ultra-high vacuum and super-low temperatures with which they slowed down pulses of light. The process also compresses the pulses from 2,500 feet to 0.002 inches in length. Photo by MaryAnn Nilsson.
Members of Hau's team included Harvard graduate students Zachary Dutton and Cyrus Behroozi. Steve Harris from Stanford University served as a long-distance collaborator.
จากคุณ :
Izawath  
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28 ส.ค. 48 00:14:38
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