University of California

Terence E Mitchell

Kenji Kitamura

Yasunori Furukawa

Venkatraman Gopalan

Provided are lithium tantalate single-crystal that requires a low voltage of not larger than 10 kV/mm for its ferroelectric polarization inversion and of which the polarization can be periodically inverted with accuracy even at such a low voltage, and a photo-functional device comprising the crystal. The crystal has a molar fraction of Li,O/(Ta,O,&plus;Li,O) of falling between 0.492 and 0.50. The functional device can convert a laser ray being incident thereon or can be used as a physical memory.

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Los Alamos, NM, United States of America

Terence E Mitchell