Abstract
Unlike the progress of wireless communication, power transmission technology to the equipment lags.
The existence of wiring and its connections greatly restricts the location, the installation, the
maintenance, and the configuration of equipment. Optical wireless power transmission (OWPT) is a key
technology for expanding the field of wireless usable equipment since it is small and provides long
distance transmission. As a demonstration of a prototype of the OWPT system, we applied a vertical
cavity surface emitting laser (VCSEL) array to achieve electric output of 10 W from a solar cell at a
transmission distance of 2 m. We applied uniform beam irradiation on the solar cell using a lens system,
a series-connected VCSEL array module and a GaAs solar cell to the prototype. Power transmission
efficiency of up to 16% was obtained. Future prospects are also discussed.
