A team of scientists from the University of Washington introduced the technology of remote charging gadgets with a laser. During the experiment, they installed the battery in the back of the smartphone and sent a narrow laser beam in the near infrared part of the spectrum from a distance of 4.3 m, which generated a power of 2 W on an area of 100 sq. Cm. As a result, the mobile phone was charged as quickly as from a normal USB cable.
The laser emitter in automatic mode determines the readiness of the gadget for charging. To prevent people accidentally being injured, four low-power beams are generated around the main laser, which are reflected and are sent back to the radiator. If, at some point, the signal is interrupted, the system is immediately disconnected.
To dissipate the excess heat generated by the charging beam, the researchers used aluminum strips as a heat sink around the radiator. However, not all heat is completely lost. Part of the energy collects the thermoelectric generator and returns it to the phone's battery.
According to scientists, such charging systems in the future will be able to charge mobile devices from a distance of 12 meters on an area of 100 square meters. centimeters.