Powerlight Technologies

PowerLight Technologies is a U.S. engineering firm providing power transmission via lasers. Its primary products are Power-over-fiber which transmits energy in the form of laser light through an optic fiber, and "laser power beaming" in which the laser energy is transmitted through free space.

PowerLight Technologies
Engineering
GenreLasers
PredecessorLaserMotive
FounderTom Nugent and Jordin Kare
HeadquartersKent, Washington
Websitepowerlighttech.com

History

The predecessor to PowerLight Technologies, LaserMotive, was founded in 2006 by physicists Tom Nugent[1] and Jordin Kare.[2] The company's initial goal was to win the NASA Centennial Challenges Power Beam challenge. After winning the challenge, LaserMotive focused on developing the power beaming technology for commercial application on UAVs and successfully demonstrated the transfer of 400 watts of power over 1 kilometer.[3]

In 2017, LaserMotive changed its name to PowerLight Technologies, hired three new advisors, and officially announced the launch of commercial applications for its power-over-fiber technology.[4] The company's new CEO Richard Gustoffson described this new focus on power-over-fiber as a "major transformation" for the company.[5] PowerLight also continues to work toward commercial application of its technology to free-space power transmission.

Technology

The power beaming system uses a laser running from a power supply. To define the beam size at its destination, the laser's light can be shaped by a set of optics. This light energy can be sent through air or the vacuum of space, onto a photovoltaic (PV) receiver, where it is converted back into electricity.[6]

In addition to delivering energy through air or space, PowerLight adapted the technology to deliver electricity through an optical fiber.[7] By transmitting a focused laser light through optical fiber to a solar cell-like receiver, this technology allows for power to be provided over hundreds of meters in environments where electric transmission by copper wire is not optimal, either due to the higher weight of wire compared to glass fiber, or due to operational constraints imposed by electromagnetic fields generated by electrical transmission by wire. Uses include ground, air, and underwater applications.

The electrical-to-optical conversion efficiency of modern laser technology can be as high as 85%,[8] and off-the-shelf semiconductor diode lasers can have an output efficiency of around 50%.[9] The optical-to-electrical conversion efficiency of a photovoltaic receiver can be over 50% for monochromatic (or laser) light.[10]

Applications

PowerLight Technologies has investigated numerous applications for its laser power beaming technology, including transmission of power both to and from the ground, spacecraft, aerial vehicles, satellites, and a lunar rover.[11]

Tether propulsion

The company's stated first goal was to win the Beam Power Challenge, part of the Space Elevator Games, to power a small climber up a vertical tether. They partnered with The Boeing Company, which provided them with test facilities, as well as specialized solar cells.[12] In 2007, they failed to qualify for the Challenge due to difficulties meeting NASA's specifications.[13][14]

At the 2009 Challenge, on November 6, 2009, LaserMotive successfully used lasers to drive a 4.8 kg (11 lb) device up a 900 m (2,950 ft) cable suspended from a helicopter.[15][16] Energy is transmitted to the climber using a high-power infrared beam.[17] LaserMotive's entry, which was the only one to top the cable, reached an average speed of 13 km/h (8.1 mph) and earned a $900,000 prize. This marked both a performance record, and the first award of a cash prize at the Challenge.[16]

Aircraft propulsion

On October 28, 2010, PowerLight set a flight endurance record at the Future of Flight Center by powering a quadcopter UAV for more than 12 hours using infrared semiconductor diode lasers to power a small photovoltaic array.[18] The vehicle was equipped with a small on-board battery capable of only a few minutes of flight.

On August 7, 2012, PowerLight equipped a Lockheed Martin Stalker UAS with a laser receiver, and the system was successfully demonstrated during day and night operations in the desert. This series of demonstration flights is described as "the first-ever outdoor flight of a UAS powered by laser".[19][20]

See also

References

  1. "Tom Nugent". LaserMotive. Archived from the original on 2012-07-18. Retrieved July 9, 2012.
  2. "Jordin Kare". LaserMotive. Archived from the original on 2012-06-29. Retrieved July 9, 2012.
  3. http://www.nasa.gov/offices/oct/stp/centennial_challenges/after_challenge/lasermotive.html
  4. Levy, Martin (2017-12-11). "PowerLight Technologies, formerly known as LaserMotive, is First to Market with Commercialized High-Power, Long Distance Optical Power over Fiber" (Press release). Seattle: Powerlight Technologies. GlobeNewswire. Retrieved 2018-07-09.
  5. Boyle, Alan (2017-12-08). "LaserMotive makes a switch to PowerLight and focuses on beaming power over fiber". GeekWire. Retrieved 2018-07-09. The Kent, Wash.-based company was founded a decade ago and first made its mark at NASA’s Power Beaming Challenge in 2009 as the winner of a $900,000 prize. Back then, LaserMotive used laser beams to transmit power to a cable-climbing robot. After several years of behind-the-scenes work, PowerLight is now working with commercial and military customers to perfect a system that can transmit power in the form of laser light to underwater robotic vehicles, drones in the air, and industrial installations on the ground.
  6. Suriyanarayanan, Balachander (2011-03-13). "LaserMotive's power beaming system prepares ground for space elevator's lift-off". International Business Times. Retrieved 2011-03-14. the system starts with a laser running from a power supply, with the laser light shaped by a set of optics to define the beam size at its destination. This light then propagates through air or the vacuum of space until it reaches the photovoltaic (PV) receiver. This array of PV cells then converts the light back into electricity. Laser Power Beaming only requires physical installations at the transmitting and receiving points, and nothing in between. The receiver can be moved to a different location, closer or further away, without changing the cost of the system. And power can be available as soon as the elements are placed and turned on, instead of having to wait for wires to be buried or hung from poles.
  7. https://www.youtube.com/watch?v=wQ3Zh85Ki_c
  8. Paul Crump, et al.,SHEDs Funding Enables Power Conversion Efficiency up to 85% at High Powers from 975-nm Broad Area Diode Lasers. Retrieved October 3, 2019.
  9. Power Beaming with Diode Lasers, 2008.
  10. http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4922910
  11. NBC News
  12. "LaserMotive at Space Access '08". Space Prizes. 2008-04-01. Retrieved 2009-11-07.
  13. "LaserMotive Corporate Background" (PDF). LaserMotive. 2008-07-30. Retrieved 2009-11-07.
  14. Jordin T., Kare; Nugent Jr, Thomas J. (2007). Pakhomov, Andrew V. (ed.). Beamed Energy Propulsion: Fifth International Symposium on Beamed Energy Propulsion. AIP Conference Proceedings. 997. American Institute of Physics. pp. 97–108. doi:10.1063/1.2931935. ISBN 978-0-7354-0516-5.
  15. "Second Day Results". Space Elevator Games. The Spaceward Foundation. 2009-11-05. Retrieved 2009-11-07.
  16. Moskowitz, Clara (2009-11-06). "Seattle Team Wins $900,000 in Space Elevator Contest". Space.com. Retrieved 2009-11-07.
  17. "Main". Blog. LaserMotive. Archived from the original on 2009-10-18. Retrieved 2009-11-07.
  18. "Copter sets a laser-powered record". Archived from the original on 2011-01-08. Retrieved 2011-02-08.
  19. Press release, "Lockheed Martin Performs First Ever Outdoor Flight Test Of Laser Powered UAS", August 2012. Archived from the original.
  20. https://www.youtube.com/watch?v=Tqwqnj-oGyo
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