Generation and Directivity Control of Bulk Acoustic Waves by Phase Velocity Scanning of Laser Interference Fringes
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概要
- 論文の詳細を見る
A nccvel method for generating high-frequency bulk acoustic waves (BAW) using scanning interference fringes (SIF) is presented. The SIF are produced by intersecting two coherent laser beams with differernt frequencies on an opaque specimen. It is possible to generate unidirectional BAW which propagate into the specimen by this method. Propagation direction of the BAW is determined by the phase-matching condition between the SIF and the wave front of the BAW at the surface, which could be controlled by incident angles of laser beams. The principie of this method and experimental verification using a sintered Si_3N_4 specimen are described. Experiments were carried out using a 15 mJ/130 ns Q-switched Nd:YAG laser for 80 MHz BAW generation and optical knife-edge method with 50 mW argon-ion CW laser for detection. Directivity of BAW was steered from 24.5° to 77.5° by changing the incident angles of the laser beams from 0.066° to 0.136°. BAW were found to be well collimated especially in the near field.
- 社団法人応用物理学会の論文
- 1995-05-30
著者
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NAGATA Yoshihiko
Mechanical Engineering Laboratory
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KODA Toshio
Mechanical Engineering Laboratory
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Yamanaka Kazushi
Mechanfical Engineering Laboratory
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NAGATA Yujiro
College of Science and Engineering, Aoyama Gakuin University
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Koda T
Mechanical Engineering Laboratory
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Nagata Y
College Of Science And Engineering Aoyama Gakuin University
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Nagata Yujiro
College Of Science & Engineering Aoyama Gakuin University
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Nishino H
Faculty Of Science And Engineering Aoyama Gakuin University
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CHO Hideo
Graduate School of Engineering, Tohoku University
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NISHINO Hideo
Technical Research Institute, Toppan Printing Co., Ltd.
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TSUKAHARA Yusuke
Technical Research Institute, TOPPAN Printing Co., Ltd.
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Tsukahara Y
Technical Research Institute Toppan Printing Co. Ltd.
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Tsukahara Yusuke
Technical Research Institute Toppan Printing Co. Ltd.
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Terada Yasuhiko
Department Of Applied Physics School Of Engineering The University Of Tokyo
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