High-powered lasers can be used to steer lightning strikes
Lightning rods have been used to safely guide strikes into the ground since Benjamin Franklin’s day, but their short range (roughly the same radius as the height) and fixed-in-place design makes them ineffective for protecting large areas. The technology may finally be here to replace them in some situations. European researchers have successfully tested a system that uses terawatt-level laser pulses to steer lighting toward a 26-foot rod. It’s not limited by its physical height, and can cover much wider areas — in this case, 590 feet — while penetrating clouds and fog.
The design ionizes nitrogen and oxygen molecules, releasing electrons and creating a plasma that conducts electricity. As the laser fires at a very quick 1,000 pulses per second, it’s considerably more likely to intercept lightning as it forms. In the test, conducted between June and September 2021, lightning followed the beam for nearly 197 feet before hitting the rod.
Researchers have been exploring laser lightning guides for years. However, experiments have typically been limited to much shorter distances and relatively slow pulses that were more likely to miss lighting as it formed. Dr. Aurélien Houard, who helped lead the …read more
