Abstract

High erase sensitivity is observed in heavily reduced crystals of Fe-doped LiNbO3. Only 12 mJ/cm2 of incident 4880-Å radiation erases a hologram, nearly 3 orders of magnitude less energy than previously required. However, the maximum diffraction efficiency that can be reached in these crystals is substantially reduced. These results are shown to be consistent with an extremely low density of Fe3+ ions. The crystals are resistant to optical scattering effects usually observed in Fe-doped LiNbO3.

© 1974 Optical Society of America

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