Real-time holography via DFWM in thin liquid crystal films and thin photorefractive materials

We describe a coherence filtering technique in the near infrared (IR) based on degenerate four wave mixing (DFWM) in a Barium Titanate photorefractive crystal and a dye-doped liquid crystal layer. in our experiments, we used a self modelocked Ti:Sapphire laser and a Q-switched alexandrite laser as light sources. This technique can be used to provide instantaneous, single-shot, two-dimensional images ofthe internal structure ofmaterials versus depth.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.