The photorefractive effect of smectic liquid crystal mixtures was investigated and the application to laser ultrasonic measurements was demonstrated. Smectic liquid crystal mixtures, composed of smectic-C liquid crystals, photoconductive chiral compounds, and a sensitizer, exhibit a fast photorefractive effect. The principle of ultrasonic measurement is that a nanosecond laser pulse is shot on an object to cause an ultrasonic vibration, a continuous laser beam is irradiated on the object, and the ultrasonic variation is detected using photorefractive two-beam coupling. This method can investigate an object's thickness and internal structure without contact.
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