The U.K. military has successfully tested a high-power laser weapon designed to knock drones out of the sky.
The laser weapon, dubbed "DragonFire," passed its first field test by shooting down several drones over the Hebrides off the coast of Scotland, the U.K. government announced on Jan. 19.
Currently, drone strikes can be repelled by firing expensive missiles that can cost up to $2 million each. But the cost of operating the new laser is "typically less than £10 (l $13) per shot", the U.K. government claimed. Its maximum range is classified, but the weapon can "engage with any visible target," the statement noted.
"This type of cutting-edge weaponry has the potential to revolutionise the battlespace by reducing the reliance on expensive ammunition, while also lowering the risk of collateral damage," Grant Shapps, the U.K. defense secretary, said in the statement.
Anti-drone lasers are defensive weapons designed to disable or even slice through drones and subsonic missiles with more accuracy and less destruction than the missiles used today. Several countries have developed versions of the technology — including the U.S., Germany, Israel and Turkey — although these systems aren't widely deployed.
This is partly owing to the difficulty and high cost of manufacturing beam directors, which guide the laser shots to the targets. Anti-drone lasers also have a much shorter range than conventional anti-drone missiles, and they’re not able to deliver enough power quickly enough to shoot down hypersonic objects that move five times faster than the speed of sound.
In addition, laser weapons have to be finely tuned. If the beam is too intense, interactions with the air can cause the beam to scatter, but if the beam is too weak, the target remains unaffected. Additionally, water droplets can absorb or scatter the beam, making it perform poorly in adverse weather conditions.
The weapon's accuracy on choppy waters is also unclear, said Gianluca Sarri, a physics professor and laser expert at Queen's University Belfast, in an article in The Conversation, meaning its use on rough seas could be limited.
"It is like trying to hit the bullseye on a dartboard while standing on a balance board," Sarri wrote. "However, this will only affect the accuracy of the weapon, without increasing the risk of collateral damage."
The U.K. government said it will continue to invest in laser defense technologies and push forward plans that will see them brought into service, although when and how they will be developed further remains to be seen.
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Ben Turner is a U.K. based staff writer at Live Science. He covers physics and astronomy, among other topics like tech and climate change. He graduated from University College London with a degree in particle physics before training as a journalist. When he's not writing, Ben enjoys reading literature, playing the guitar and embarrassing himself with chess.