Abstract
The efficiency of guided-wave acousto-optic diffraction is proportional to the total power flow Pa in the incident surface acoustic wave (SAW) beam. The efficiency and frequency response of guided-wave acousto-optic devices, therefore, are a strong function of the characteristics of the transducer used to excite the incident acoustic beam [4.1]. As described in Chap. 1, the interdigital-electrode SAW transducer [4.2,3], illustrated in Fig.4.1, is utilized as the acoustic excitation source in all guided-wave acousto-optic devices under study today. The planar format and the relatively high electro-acoustic conversion efficiency of this transducer make it ideal for acousto-optic applications. Moreover, it is possible to fabricate multiple transducer arrays [4.1,4] which greatly extend the bandwidth of acousto-optic interaction by optimizing the spatial phase match of the acoustic and optic beams over a wide range of frequency.
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Reeder, T.M. (1990). Excitation of Surface-Acoustic Waves by Use of Interdigital Electrode Transducers. In: Tsai, C.S. (eds) Guided-Wave Acousto-Optics. Springer Series in Electronics and Photonics, vol 23. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-75225-4_4
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DOI: https://doi.org/10.1007/978-3-642-75225-4_4
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