Abstract

Unintended erasure of the recorded hologram during the readout has been a main problem in the holographic memory using the photorefractive material. One of the simplest solutions is to read the hologram at a longer wavelength outside the sensitive spectral region of the recording media. However, the reconstruction at a wavelength different from the recording one leads to a deterioration of the reconstructed image, or narrowing the image field due to the Bragg’s low. Up to now, the anisotropic diffraction¹⁾ and the spherical probing beam²⁾ have been proposed to solve this problem.

© 2007 IEEE