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The photorefractive effect of flexoelectric smectic liquid crystal mixtures was investigated and applied to a laser ultrasonic remote sensing. Smectic liquid crystal mixtures, composed of smectic-C liquid crystals, photoconductive chiral compounds and a sensitizer, are known to exhibit a large photorefractive effect. The principle of the ultrasonic remote sensing is that a laser beam is irradiated on an object and the variation in the reflected light is detected by photorefractive two-beam coupling. This remote sensing method can be used to probe the internal structure of an object or to measure the thickness of a plate object without contact.
Takeo Sasaki,Takaaki Yagami,Toshinobu Takashi,Khoa Van Le, andYumiko Naka
"Photorefractive effect of smectic liquid crystals and their application to laser ultrasonic remote sensing", Proc. SPIE 12151, Photosensitive Materials and their Applications II, 121510B (24 May 2022); https://doi.org/10.1117/12.2620786
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Takeo Sasaki, Takaaki Yagami, Toshinobu Takashi, Khoa Van Le, Yumiko Naka, "Photorefractive effect of smectic liquid crystals and their application to laser ultrasonic remote sensing," Proc. SPIE 12151, Photosensitive Materials and their Applications II, 121510B (24 May 2022); https://doi.org/10.1117/12.2620786