guard beam tagged posts

The wireless charging system created by University of Washington engineers. The charging laser and guard lasers are normally invisible to the human eye, but red beams have been inserted in place of the guard beams for demonstration purposes.Mark Stone/University of Washington

Although mobile devices such as tablets and smartphones let us communicate, work and access information wirelessly, their batteries must still be charged by plugging them in to an outlet. But engineers at the University of Washington have for the first time developed a method to safely charge a smartphone wirelessly using a laser. A narrow, invisible beam from a laser emitter can deliver charge to a smartphone sitting across a room – and can potentially charge a smartphone as quickly as a standard USB cable...