Photorefraction of uranium-doped lithium niobate crystals at multiple visible wavelengths.

A series of uranium-doped lithium niobate crystals (LN:U) were successfully grown by the modified vertical Bridgman method, and their photorefractive properties in the visible band were systematically investigated for the first time. The occupancy of uranium ions and photorefractive centers is discussed. LN:U realizes multi-wavelength holography. [ABSTRACT FROM AUTHOR]