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J. Dewhurst, A. G. Nurse and S. B. Palmer, Ultra­ sonics, 26 (1988) 307. 9 W. -H. Pao, /. Appl. , 49 (1978) 4320. 10 LA. Viktorov, Rayleigh and Lamb Waves, Plenum, New York, 1967. 11 S. C. Schneider, IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 36 (1989) 114. 37 Efficient Generation of Acoustic Pressure Waves by Short Laser Pulses S. FASSBENDER, B. HOFFMANN and W. ARNOLD Fraunhofer-lnstitute for Non-Destructive Testing, Bldg. ) (Received June 2,1989) Abstract normal to the propagation direction contain com­ ponents travelling with pressure (longitudinal) The displacement of laser-generated ultrasonic wave velocity and shear (transverse) wave veloc­ bulk waves in polycrystalline metal samples con­ ity [10-12].

With a maximum power of 20 MW and a maxi­ mum energy of 600 mJ. 5 mm respectively (measured at 1/e points of the intensity profile). By using a plano-convex lens, the incident power density on the sample surface was increased well beyond the material ablation threshold. The opti­ cal energy incident on the sample was varied by the use of neutral density filters. Various polycrystalline metal samples were investigated. 9mmjus~l,vT = 32mm/is~l). The generated bulk waves were detected in a contactless way by a capacitance transducer, allowing the broad band measurement of the absolute vertical displacement of the sample surface.

With a maximum power of 20 MW and a maxi­ mum energy of 600 mJ. 5 mm respectively (measured at 1/e points of the intensity profile). By using a plano-convex lens, the incident power density on the sample surface was increased well beyond the material ablation threshold. The opti­ cal energy incident on the sample was varied by the use of neutral density filters. Various polycrystalline metal samples were investigated. 9mmjus~l,vT = 32mm/is~l). The generated bulk waves were detected in a contactless way by a capacitance transducer, allowing the broad band measurement of the absolute vertical displacement of the sample surface.

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