The laser charger was able to transmit energy to a device at a distance of 30 meters

Transmitting energy over a distance is much more difficult than information. The problem is difficult, but its solution can make the use of mobile electronics much more comfortable. Experts from Sejong University in Korea propose using an infrared laser to do this. Their technology is promising and has already proven to be practicable.

The light, which has a fundamental wavelength of 1550 nm, is emitted by an erbium-doped transmitter. Through the air its rays reach the receiving device, the main components of which are a spherical lens and a retroreflector. The line of sight is important for the proper operation of the system. When an obstacle is encountered, the automation switches to a minimum power state in which it can do no harm.

The first tests completed successfully. The developers managed to transmit 400 mW of power to a distance of 30 meters. The photodetector was able to transform the received radiation into 85 mW of current. Of course, this is not enough, but the authors of the invention are confident that the system can be brought to the characteristics applicable in everyday life. Its advantages include the absence of the need to fine-tune the receiving part, and the equipment can be placed in any room without additional preparation.