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Lasers Generate Sound in H2O

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WASHINGTON, DC, Sept. 8, 2009 – A new technology that uses flashes of laser light to remotely create underwater acoustics is being developed by scientists at the Naval Research Laboratory. The new acoustic source has the potential to expand and improve both Naval and commercial underwater acoustic applications, including undersea communications, navigation and acoustic imaging. Dr. Ted Jones, a physicist in the plasma physics division, is leading a team of researchers from the plasma physics, acoustics, and marine geosciences divisions in developing this acoustic source. Scattered light from a 532-nm laser pulse can...Read full article

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    Published: September 2009
    Glossary
    doppler effect
    The effect produced on a wave frequency because of the relative motion of a source or an observer. The radiation emitted from a source that moves away from an observer appears to be of lower frequency than the radiation emitted from a stationary source. The radiation emitted from a source moving toward the observer appears to be of a higher frequency than that from a stationary source.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
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