Abstract

Photorefractive crystals are promising candidates for volume-holographic-storage materials, but undesired erasure during readout remains a problem. One of the approaches to solving the problem is two-wavelength technique, in which holograms are recorded with a short-wavelength light and read with a longer-wavelength light.^1,2 Recording with a green light and reading with a red light was reported, but the reported decay time in the red spectral region² was not long enough for real application to volume holographic storage. We studied the decay rate in the near-infrared region for some photorefractive crystals. Much longer decay times were observed.

© 1995 Optical Society of America