Acoustic Fields of Bulk Acoustic Waves Excited by Phase Velocity Scanning of Laser Interference Fringes.

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  • Nishino Hideo
    Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
  • Tsukahara Yusuke
    Technical Research Institute, TOPPAN Printing Co., Ltd., 4-2-3 Takanodai-Minami, Sugito-machi, Kitakatsushika-gun, Saitama 345-8579, Japan
  • Takemoto Mikio
    Faculty of Science and Engineering, Aoyama Gakuin University, 6-16-1 Chitosedai, Setagaya-ku, Tokyo 157-8579, Japan
  • Yamanaka Kazushi
    Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

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Directivity and generation efficiency of transverse and longitudinal bulk acoustic waves (BAWs) excited by phase velocity scanning (PVS) of laser interference fringes were theoretically investigated. Formulas were derived for the BAW generation based on scanning interference fringes (SIF) which were produced by intersecting two coherent laser beams with different frequencies on an opaque specimen. It was deduced that the amplitude of the BAW was proportional to the product of the scanning length of the SIF and the directivity pattern due to the thermoelastic line source. Unidirectionality of the BAW generated by the SIF was theoretically verified in an ideal state.

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