The US Navy has unveiled its latest weapon - a laser cannon capable of shooting down drones and disabling vessels.
A prototype of the Laser Weapon System (LaWS) installed on the destroyer USS Dewey is believed to have cost up to $32m (£21m) to make.
However, it runs on electricity and costs as little as $1 (66p) to fire - a fraction of the cost of conventional weaponery.
"The future is here," said Peter Morrison of the Office of Naval Research.
"The solid-state laser is a big step forward to revolutionising modern warfare with directed energy, just as gunpowder did in the era of knives and swords."
The US Navy released a video of LaWS being used to shoot down a drone off the coast of San Diego, California.
The system is expected to be installed permanently on USS Ponce in the next financial year.
A spokesman for the US Navy described LaWS as "revolutionary technology that gives the Navy an extremely affordable, multi-mission weapon with a deep magazine and unmatched precision, targeting and control functions".
However, a report by the Congressional Research Service noted several drawbacks, including the potential for laser beams to strike satellites or aircraft.
The system could also be affected be rain or fog.
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