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A pulsed laser (time-stained laser) that strikes a diffraction lens (a lens that distributes colors along its axis) generates a flying focus, which is captured by a high-speed film. Credit: Eugene Kawaluk (University of Rochester)
Scientists have created an extremely bright point of light that can move at any speed, including faster than the speed of light. Researchers have found a way to use this concept, called "flying focus", to move an intense laser focal point over long distances at any speed. Their technique is to capture some of the fastest movies ever recorded.
A "focus in flight" combines a lens that focuses specific colors of light at different locations with the recent Nobel laureate pulsation pulse amplification technology, which organizes the colors of light in the weather. Imagine a laser producing a rainbow of colors in perpetual change, starting with blue and ending with red. Now, focus the light with a lens that focuses the red light near the lens and the blue light much farther away from the lens. Due to the delay between the colors, the high intensity focal point moves. By changing the delay between the different colors, you can make this point move at any speed.
"The flight goal is proving super powerful," said Dustin Froula, head of the Plasma Physics Group at the University of Rochester's Laser Energy Lab. "This allows us to generate high intensities hundreds of times the distance from what we could before and at any speed.We are now trying to make the next generation of high-power lasers and Flying focus could be this technology.His team, supported by the Ministry of Energy's Energy Merger Science Office, will present this research at the next meeting of the Division of Energy. Physical plasma of the American Physical Society in Portland, Oregon.
"Our group decided to design an experiment to measure the propagation of a focal point at any speed, including 50 times faster than light.This required a new diagnosis to make a film with images separated by a trillionth of a second, "Froula said.
In addition to contributing to the inauguration of the next generation of high-power lasers, this research has the potential to produce new light sources, such as those generating light of almost any color.
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Researchers use "focus vol" to better control lasers over long distances
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