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May 7, 2021 01:00 pm

Scientists Create Record-Breaking Laser With Mind Blowing Power

An anonymous reader quotes a report from Motherboard: For the Korean research team led by senior author Chang-hee Nam, a plasma physicist and professor at Gwangju Institute of Science & Technology, their breakthrough in laser science may be a physically small feat (striking an area the size of a micron) but will have a huge impact on how we study not only cosmic phenomena from the beginning of time but how we treat cancer as well. After ten years of toiling, the team has demonstrated in a paper published on Thursday in the journal Optica the development of a laser with record-breaking intensity over 10^23 watts per square centimeter. Nam told Motherboard in an email that you can compare the intensity of this laser beam to the combined power of all of the sunlight across the entire planet, but pressed together into roughly the size of a speck of dust or a single red blood cell. This whole burst of power happens in just fractions of a second. "The laser intensity of 10 W/cm is comparable to the light intensity obtainable by focusing all the sunlight reaching Earth to a spot of 10 microns," explained Nam. To achieve this effect, Nam and colleagues at the Center for Relativistic Laser Science (CoReLS) lab constructed a kind of obstacle course for the laser beam to pass through to amplify, reflect, and control the motion of the photons comprising it. Because light behaves as both a particle (e.g. individual photons) as well as a wave, controlling the wavefront of this laser (similar to the front of an ocean wave) was crucial to make sure the team could actually focus its power. Nam explains that the technology to make this kind of precise control possible has been years in the making. Nam said that the ultrahigh power laser design played a role in this discovery by helping remove beam distortions while the deformable mirrors made it possible to have "extremely tight focusing without any aberrations." Beyond being a scientific breakthrough, Nam said that this high-intensity laser will open doors to explore some of the universe's most fundamental questions that had previously only been explored by theoreticians. Nam also said that these lasers have a more terrestrial purpose as well in the form of cancer treatment technology.

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