infrared visualization with two-wave mixing in photorefractive BaTiO3 Crystal

Holographic gratings recorded in BaTiO3 with five different wavelengths have been studied. Using the knowledge of grating formation developed in this way, we have visualized infrared images in BaTiO3 with two different two-wave mixing configurations. Key words: Photorefraction, hologram, infrared visualization. In the past several years, there has been a growing interest in optical image processing with photorefractive materials. Various photorefractive devices have been demonstrated by different groups with applications in optical correlators, ' image amplification, 2) incoherent-to-coherent convertors, ' novelty filters,1 ' data storage,1 5 dynamic interferometers, 6 1 etc.. Although progress has been achieved in the near-infrared (IR) region, th