Abstract
In this study, to obtain an acousto-optic modulator (AOM) driven by a longitudinal leaky surface acoustic wave (LLSAW) with a lower driving voltage and a higher diffraction efficiency, proton-exchanged optical-waveguide-type AOMs with structures consisting a LiNb03 (LN) thin plate bonded to a quartz or sapphire (Al203) substrate were fabricated and their diffraction properties were evaluated. The maximum diffraction efficiency in the TEo mode with an optical wavelength of 0.633 μm and the driving voltage required by the LLSA Ws of AOMs were 91 % and 5.1 VRMS for LN/quartz and 60% and 11 VRMS for LN/Al203, respectively. The diffraction properties of the LLSAWs on the bonded structures were improved compared with those on a single LN substrate.
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