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Ultrasonic generation with a pulsed TEA CO2 laser

The authors have demonstrated that air breakdown produced just above a metal surface by a pulsed CO2 TEA laser, is an efficient source of ultrasound within the metal. The normal force source produces both longitudinal and shear waves in the bulk and Rayleigh surface waves. No damage is produced on the metal surface. Electromagnetic acoustic transducers provide complementary noncontacting detectors.