Science Daily  August 30, 2022 Researchers in South Korea used an erbium-doped fiber amplifier optical power source with a central wavelength of 1550 nm. and wavelength division multiplexing filter that created a narrowband beam with optical power within the safety limits for free space propagation. They optimized distributed laser charging which enables self-alignment without tracking processes and automatically shifts to a safe low power delivery mode if an object or a person blocks the line of sight. They incorporated a spherical ball lens retroreflector in the receiver unit to facilitate 360-degree transmitter-receiver alignment, which maximized the power transfer efficiency. The […]