Abstract
Two‐dimensional (2‐D) optical beam scanning is obtained by using a leaky surface acoustic wave device. The device consists of two interdigital transducers (IDTs) on one of the surfaces of a piezoelectric substrate, operating at a liquid‐solid boundary. Ultrasound radiated into the liquid from each of two IDTs is valid for acousto‐optic (AO) deflection gratings, one for horizontal and the other for vertical deflection. The fundamental performance of the AO deflector is characterized in the relation of the input electrical admittance of the leaky wave transducer with the specific acoustic impedance of the liquid by an equivalent circuit model analysis. The device has the linearity essential for a laser scanner in a wide frequency range. The 3‐dB intensity area of the 2‐D deflected spot is 0.8 deg for a frequency bandwidth of 30 MHz. The access time is 0.66 μs, and the reasonable spot numbers are 20×20 for an optical beam diameter of 1 mm.
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