Researchers transmit energy with laser in 'historic' power-beaming demonstration

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The U.S. Naval Research Laboratory

Oct 22, 2019, 10:00 ET

WASHINGTON, Oct. 22, 2019 /PRNewswire/ -- It was the second day of a three-day-long tech demonstration at the David Taylor Model Basin at the Naval Surface Warfare Center in Bethesda, Maryland, where attendees had gathered to stand around in the dark to look at something they mostly couldn't see.

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During a three-day-long tech demonstration at the David Taylor Model Basin at the Naval Surface Warfare Center in Bethesda, Maryland, attendees gathered to see a long-range, free-space power beaming system. Attendees this day, May 23, could see the system itself—the two 13-foot-high towers, one a 2-kilowatt laser transmitter, the other a receiver of specially designed photovoltaics. But the laser that was beaming 400 watts of power across 325 meters, from the transmitter to the receiver, was inv
During a three-day-long tech demonstration at the David Taylor Model Basin at the Naval Surface Warfare Center in Bethesda, Maryland, attendees gathered to see a long-range, free-space power beaming system. Attendees this day, May 23, could see the system itself—the two 13-foot-high towers, one a 2-kilowatt laser transmitter, the other a receiver of specially designed photovoltaics. But the laser that was beaming 400 watts of power across 325 meters, from the transmitter to the receiver, was inv
Captured by a special camera, a laser beam invisible to the naked eye shoots across the dark expanse of the David Taylor Model Basin at the Naval Surface Warfare Center in Bethesda, Maryland. (U.S. Navy)
Captured by a special camera, a laser beam invisible to the naked eye shoots across the dark expanse of the David Taylor Model Basin at the Naval Surface Warfare Center in Bethesda, Maryland. (U.S. Navy)

It was a long-range, free-space power beaming system - the first of its kind. Attendees that day, May 23, could see the system itself—the two 13-foot-high towers, one a 2-kilowatt laser transmitter, the other a receiver of specially designed photovoltaics. But the important part, the laser that was beaming 400 watts of power across 325 meters, from the transmitter to the receiver, was invisible to the naked eye.

On one end of the of the testing facility — one of the largest test facilities for model ships in the world — the receiver was converting the laser energy to DC power, which an inverter was turning into AC power to run lights, several laptops, and a coffeemaker that the organizers were using to make coffee for the attendees, or "laser lattes."

As more than one person there had noted, it wasn't exactly an exciting scene. But when you're transmitting hundreds of watts of power with a laser beam "exciting" is not what you're aiming for. You want it quiet, boring and, most importantly, safe. And so it was.

"Power beaming, the concept, has been around for decades and there've been laboratory demonstrations, but this is really a first and a new technology that's getting fielded," explained Tom Nugent, chief technology officer of PowerLight Technologies, the hardware provider for the Power Transmitted Over Laser (PTROL) project.

The culmination of the PTROL project's second phase, the demonstration was two years in the making for PowerLight and Paul Jaffe, an electronics engineer with the U.S. Naval Research Laboratory. During a briefing that preceded the demo, Jaffe had described that day's demonstration as historic.

Early power beaming demonstrations took place in 1975, the first in Waltham, Massachusetts in the laboratories of Raytheon, and the second at the Goldstone Station of the Nasa Deep Space Network in California. Those were the two most important such demonstrations in history, Jaffe told his audience.

"The third one you're going to see in a few minutes," he said.

By Emanuel Cavallaro, Corporate Communications, U.S. Naval Research Laboratory

Editor Contact: Daniel Parry, U.S. Naval Research Laboratory Public Affairs
[email protected]
202-767-2541

SOURCE The U.S. Naval Research Laboratory