Lasers can send a whispered audio message directly to one person’s ear

23 January 2019

 

New Technology Uses Lasers to Transmit Audible Messages to Specific People

Photoacoustic communication approach could send warning messages through the air without requiring a receiving device

 

WASHINGTON — Researchers have demonstrated that a laser can transmit an audible message to a person without any type of receiver equipment. The ability to send highly targeted audio signals over the air could be used to communicate across noisy rooms or warn individuals of a dangerous situation such as an active Ryan M. Sullenberger and Charles M. Wynn developed a way to use eye- and skin-safe laser light to transmit a highly targeted audible message to a person without any type of receiver equipment. “In this new paper, we show that sweeping a laser beam at the speed of sound at a wavelength absorbed by water can be used as an efficient way to create The researchers use water vapor in the air to absorb light and create sound.

Source: www.osa.org