Abstract
Abstract The dynamics of optical erasure of holographic gratings formed by one-photon and two-photon photorefractive processes in iron-doped (150 ppm) LiNbO3 have been studied as a function of wavelength of the erasing light. At a given erasing wavelength and intensity, the time constant for erasure of holograms recorded at 0.61 μm by a two-photon process is similar to that for erasure of one-photon holograms of the same grating spacing recorded at 0.488 μm; thus the same ultimate traps appear to be involved in both recording processes. The minimum photon energy required to empty these traps is not greater than 1.9 eV. Rapid erasure occurs when the photon energy is above 2.35 eV. These results will be compared with erasure dynamics in nominally undoped LiNbO3, and with the recording dynamics in the doped and undoped materials; and the implications for photorefractive recording mechanisms will be discussed.
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