HOLOGRAM STORAGE AND RETRIEVAL IN PHOTOCHROMIC STRONTIUM TITANATE CRYSTALS

Experimental results are here presented to show that hologram efficiencies of 1.2% can be obtained with photochromic SrTiO3 materials and that patterns of 104 bits/cm2 can be read out up to 107 time before destroying the stored information. It is also shown that the nonlinear absorption properties of the material can be used to store holograms at the ruby laser wavelength where the materials are nominally transparent in the ground state. © 1969 Optical Society of America.