Word: walsworth
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...redder light when gravity nudges the star towards an observer and bluer light when gravity moves it away. But these shifts are often too small to accurately measure. “You could find Jupiters but you couldn’t find Earths,” said Ronald L. Walsworth, a senior physics lecturer who helped lead the project. “We had a great car but it was missing a tire.” Calibrated to an atomic clock—“the best measuring device man has in his quiver,” according...
...Lene V. Hau, McKay professor of applied physics, supervised an experiment that slowed light to about 40 m.p.h. In 2001, a team led by Lukin and Ronald Walsworth of the Harvard Smithsonian Center for Astrophysics, and independently, a team led by Hau, stopped a light pulse by storing it in the form of excited atoms to be converted back into a light pulse...
...years later, David F. Phillips, an associate of the Harvard College Observatory at the Harvard-Smithsonian Center for Astrophysics; Ronald L. Walsworth, another associate; and Lukin published a study describing how the team of researchers captured a “quantum fingerprint,” or holographic imprint, of a pulse of light in a super-cooled gaseous medium...
...breakthrough - slowing light to a stop, storing it and then releasing it at will as if it were an ordinary particle - has apparently been pulled off by two independent teams of physicists, one led by Dr. Ronald L. Walsworth and Dr. Mikhail D. Lukin of the Harvard-Smithsonian Center for Astrophysics, the other by Dr. Lene Vestergaard Hau of Harvard, who made similar headlines two years ago when she slowed a beam of light down to a nearly pedestrian 38 miles an hour. Walsworth's work will be published in the Jan. 29 Physical Review Letters...
...Unsurprisingly, it's complicated. But the closely related techniques used by the two teams both involve canisters of chilled gas - Walsworth's team used rubidium, treated with a pair of laser beams that rendered it transparent - into which the light can enter without being absorbed. Instead, the first beam leaves its mark on the gas particles while the second beam is slowly turned down by the physicists. As that happens, the first beam grinds to a halt - and goes dark...