Researchers use infrared light to wirelessly transmit power over 30 meters Shri Radhe Shri Radhe Shri Radhe...

Imagine walking into an airport or grocery store and your smartphone automatically starts charging. This could be a reality one day, thanks to a new wireless laser charging system that overcomes some of the challenges that have hindered previous attempts to develop safe and convenient on-the-go charging systems..

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In the new system, the researchers used an erbium-doped fiber amplifier optical power source with a central wavelength of 1550 nm. This wavelength range is in the safest region of the spectrum and poses no danger to human eyes or skin at the power used. Another key component was a wavelength division multiplexing filter that created a narrowband beam with optical power within the safety limits for free space propagation.

"In the receiver unit, we incorporated a spherical ball lens retroreflector to facilitate 360-degree transmitter-receiver alignment, which maximized the power transfer efficiency," said Ha. "We experimentally observed that the system's overall performance depended on the refractive index of the ball lens, with a 2.003 refractive index being the most effective."

Laboratory testing

To demonstrate the system, the researchers set up a 30-meter separation between a transmitter and a receiver. The transmitter was made of the erbium-doped fiber amplifier optical source, and the receiver unit included a retroreflector, a photovoltaic cell that converts the optical signal to electrical power and an LED that illuminates when power is being delivered. This receiver, which is about 10 by 10 millimeters, could easily be integrated into devices and sensors.

The experimental results showed that a single-channel wireless optical power transfer system could provide an optical power of 400 mW with a channel linewidth of 1 nm over a distance of 30 meters. The photovoltaic converted this to an electrical power of 85 mW. The researchers also showed that the system automatically shifted to a safe power transfer mode when the line of sight was interrupted by a human hand. In this mode, the transmitter produced an incredibly low intensity light that did not pose any risk to people.

"Using the laser charging system to replace power cords in factories could save on maintenance and replacement costs," said Ha. "This could be particularly useful in harsh environments where electrical connections can cause interference or pose a fire hazard."

Now that they have demonstrated the system, the researchers are working to make it more practical. For example, the efficiency of the photovoltaic cell could be increased to better convert light into electrical power. They also plan to develop a way to use the system to charge multiple receivers simultaneously..

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