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How much power can be beamed as light?

Machine Design reports: Attendees at a three-day tech demonstration at the Naval Surface Warfare Center in Bethesda, Md. got to witness the first long-range, free-space power beaming system. It consists of the two 13-ft-high towers—one a 2-kW laser transmitter, the other a receiver of specially designed photovoltaics. The important part was the laser beaming 400 watts of power across 1,066 ft, but it was invisible to the naked eye.

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