From Live Science:
A new laser technology has made it possible to turn light into sound.
Developed by scientists at the Naval Research Laboratory, the technology has the potential to expand and improve both Naval and commercial underwater acoustic applications, including undersea communications, navigation and acoustic imaging.
This process is made possible by the compression of laser pulses. Various colors of a laser travel at different speeds in water. These colors can be arranged so that the laser pulse compresses in time as it moves through water, which concentrates the light.
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