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Researchers at the California Institute of Technology have made significant advancements in the development of laser-powered lightsails, crucial for interstellar travel. The study, published on January 30 in Nature Photonics, discusses a method to measure the force of laser light on ultrathin membranes, which could facilitate the Breakthrough Starshot Initiative's goal of sending miniature probes to Alpha Centauri.
This innovative approach uses laser beams to propel spacecraft, potentially achieving unprecedented speeds without relying on chemical propulsion. "The lightsail will travel faster than any previous spacecraft," remarked Harry Atwater, Chair of the Division of Engineering and Applied Science at Caltech.
To test their concept, researchers created a platform capable of measuring minute movements of a silicon nitride membrane when exposed to laser light. By analyzing these movements, they can determine the force exerted. Ongoing challenges include ensuring the membrane can withstand extreme conditions in space. This research is essential as NASA and other organizations explore the feasibility of solar sails for future missions.