I-5 ACOUSTO-OPTIC INTERACTIONS, DEVICES, AND APPLICATIONS

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概要

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• Acousto-Optics broadly refers to the interactions between optical (light) waves and acoustic (sound) waves. However, it is now common to refer to Acousto-Optics more narrowly to the influences of the latter upon the former since these influences have already been successfully utilized to construct various types of devices of both scientific and technological importance. Diffraction of light by sound was first predicted by Brillouin in as early as 1922. In 1932 it was observed in independent experiments by Debye and Sears, and by Lucas and Biquard. The simultaneous availability of the coherent light sources through advent of the lasers and the very high frequency acoustic waves through advancement in piezoelectric transducer technology stimulated revival of interest in the subject in the 60's. Like all previous studies, these later ones were limited to Bulk-Wave Acousto-Optics in which both the light and the sound propagate as unguided (unconfined) column of waves in mostly solid media. Concomitant success in growth of new and superior solid materials has also enabled realization of various types of bulk acousto-optic (AO) devices including modulators, scanners, deflectors, Q-switches, mode-lockers, tunable-fliters, spectrum analyzers, and correlators. Such bulk AO devices have now been deployed in a variety of commercial and military applications. In the meantime, since the early 70's, a great deal of studies have been focused on Guided-Wave Acousto-Optics in which both the light and sound waves are confined to a small depth in suitable solid substrates. This focus on Guided-Wave Acousto-Optics was a natural outgrowth of the Guided-Wave Optics science and technology and the surface acoustic wave device technology that had been undergoing intensive research and development a few years earlier. These latest studies on Guided-Wave Acousto-Optics have also already generated many fruitful results. For example, the resulting wideband planar AO Bragg modulators and deflectors are now widely used in the development and realization of microoptic modules for real-time processing of radar signals, e.g., the integrated optic RF spectrum analyzers. This lecture covers the principle of AO Bragg diffraction, the resulting devices, and applications, with emphasis on Guided-Wave Acousto-Optics. First, a brief review on Bulk-Wave Acousto-Optics in terms of the interaction geometry, the physical principles involved, the key parameters of the resulting Bragg modulators and deflectors, and some commercial products is given. The corresponding configuration and mechanisms for planar guided-wave AO Bragg diffractions are then discussed. Subsequently, a number of SAW transducer configurations for realization of wideband Bragg cells in LiNbO_3 and GaAs substrates are also presented. The lecture concludes with a progress report on realization of integrated AO device modules in LiNbO_3 planar, planar-channel, and spherical waveguides, and some of the applications of such device modules in optical communications, computing, and RF signal processing.

• 超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会の論文
• 1986-12-08

著者

• TSAI Chen

  Department of Electrical and Computer Engineering, and Institute for Surface and Interface Science,

• Tsai Chen

  Department Of Electrical Engineering University Of California

• Tsai Chen

  Department Of Electrical And Computer Engineering And Institute For Surface And Interface Science Un

関連論文

• Integrated Acousto-Optic Space Switch Modules with Applications to Multiport Optical Switching and Communications
• I-5 ACOUSTO-OPTIC INTERACTIONS, DEVICES, AND APPLICATIONS
• Integrated Acoustooptical Circuits for Real-Time Wideband Signal Processing : C-5: ACOUSTIC DEVICES

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