Phase conjugation properties and holographic associative storage of near stoichiometric Zn:In:Fe:LiNbO₃ crystals

Three types of near stoichiometric Zn:In:Fe:LiNbO₃ (Zn:In:Fe:SLN) crystal doped with 3% ZnO (in mole) and 0.03% Fe₂O₃ (in mass) and with 1% (in mole, the same below), 2% and 3% In₂O₃ were grown by the top seeded solution growth method and using K₂O as flux. The phase conjugation refractivity and phase conjugation time of the crystals were measured. The results show that in the infrared spectra, the OH^- absorption peaks for the crystals with 1%, 2% and 3% In₂O₃ are located at 3502, 3503 and 3504 cm^-1. Their steady phase conjugation refractivities are 192%, 172% and 140%, and the corresponding phase conjugation times are 3.8, 3.2 and 2.4 min, respectively. A holographic associative storage experiment was conducted using the Zn:In:Fe:SLN crystals as the storage media and a phase conjugation mirror, and the clear storage image was received by the output plane. When information was searched for based on 50% or 25% of the size of the original image, the image received was high quality for the size of 50%, and the storage image retained basic integrity for the size of 25%.