Experiment on long-term image reading in photorefractive memory with double mutually pumped phase conjugate mirrors

We propose a dynamic refreshing technique in a photorefractive memory with double mutually pumped phase conjugate mirrors. Long-term continuous readout without any fixing technique can be achieved by the high quality image refreshing that uses the resonance of the phase conjugate beams with image information between phase conjugate mirrors. We perform the experiment on the long-term reading of the images in the photorefractive memory with BaTiO₃ crystals and achieve the continuous reading time over 10 times longer than the time constant of the crystal without image degradation.