SYSTEM FOR OPTICAL WIRELESS POWER SUPPLY

• Main Authors: GOLAN, Lior, NAHMIAS, Omer, SAGI, Ran, MOR, Ori Refael, SLEPOY, Alexander, ALPERT, Ortal
• Format: Patent
• Language: English; French; German
• Published: 13.11.2019
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

The present invention relates to a laser-based system for safe wireless power transmission from a transmitter to at least one receiver, said system comprising: an optical resonator having end reflectors and a gain medium disposed within said optical resonator, said gain medium being configured to amplify light passing through it, and said optical resonator being configured to emit an optical beam of laser light; a driver configured to supply power to said gain medium, and enabling control of a small signal gain of said gain medium; an optical beam steering apparatus positioned in the path of said optical beam of laser light emitted from said optical resonator, said optical beam steering apparatus configured to direct said optical beam of laser light_in at least one of a plurality of directions; and a controller configured to receive a control input at least from a detector providing a signal indicative of the extent of impingement of said optical beam of laser light on an optical-to-electrical power converter disposed in one of said at least one receiver; said system being characterized in that said gain medium is selected such that it amplifies an optical beam of laser light passing through it, having a frequency in the region between the first overtone of the C-H absorption situated about 6940 cm-1 and the second overtone of the C-H absorption situated about 8130 cm-1, to enable said controller to detect the presence of a surface of an optically transparent organic material in the optical beam of laser light between said optical beam steering apparatus and said at least one receiver, by detecting a difference exceeding a predefined threshold or a dynamically set threshold, between the level of said optical wireless power received at said at least one receiver, and the level of said optical wireless power directed from said beam steering apparatus. The present invention also pertains to a corresponding method.