Hologram recording in Zn-doped LiNbO3 crystals

Holographic recording in LiNbO3 doped with 2-5% ZnO is reported. High photoconductivities of these crystals result in high-speed recording. Holograms are formed by a combined mechanism including photovoltaic and diffusion fields simultaneously. The contribution from the photovoltaic field. The observed values of the photovoltaic fields are higher than those calculated from the available data on photoconductivity and absorption coefficient. The enhanced values of the photovoltaic field are obviously related to the intensity dependence of the optical related to the intensity dependence of the optical absorption coefficient that results from a multilevel charge-transport scheme in LiNbO3: Zn crystals. (C) 1996 Optical Society of America