Abstract
We report directional detection of laser-generated ultrasonic waves in real as-processed objects using holographic adaptive configuration. The scheme is based on two-wave mixing in the photorefractive crystal where holographic recording occurs through the drift mechanism. Directional detecting properties are achieved by projecting the object surface irradiated by a broad probe beam onto the photorefractive sample plane. An additional slit aperture, whose orientation determines the direction of the maximal detection sensitivity, is put behind the sample into the reference wave. Its overall output intensity is measured by a single integrating photodiode. Experimental results for the scheme using Bi 12SiO 20 and operating at λ=532 nm are presented to demonstrate the idea of the proposed technique.
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