Stable Self-Pumped Phase Conjugation in BaTiO3 for High Density Storage andReadout

摘要

We present experimental results and observations on parameters affecting thestorage and stable read-out of information based on self-pumped phase conjugation (SPPC) in BaTiO3 (barium titanate). A storage scheme is described which exploits fanning in horizontal planes within the crystal. The stability of SPPC reflectivity is strongly temperature dependent, as well as being dependent on the spatial frequency content of the stored data. The stability of the conjugated signal can be greatly improved by decreasing the temperature of the crystal and by increasing spatial frequency content, for example, by artificially introducing a spatial carrier frequency. So called self pumped phase conjugation (SPPC) in BaTiO3 crystals has been exploited in various optical devices and device architectures such as interferometers, oscillators, optical neural networks, and dynamic holographic memory storage and processing.