Abstract
The photorefractive effect is a phenomenon in which the refractive index changes at the interference fringe, forming a diffraction grating (hologram). Photorefractive materials are composed of a combination of electro-optical materials and photoconductive compounds. Liquid crystals mixed with a photoconductive compound are useful as photorefractive materials because of their large birefringence and fluidity. Various applications are expected, such as amplifying optical signals, dynamic holograms, and Fourier optical elements. This article describes the development of high-performance photorefractive materials using liquid crystals and their applications in laser ultrasonics.
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