The properties of a light-induced absorption and two-color recording were investigated in three kinds of Ru and Fe codoped LiNbO3 crystals with different Fe concentrations. A nonvolatile hologram could be recorded at a wavelength of 633 nm when blue light was simultaneously incident on the crystal. The characteristic feature of these crystals is a high persistence factor , i.e., small loss of the hologram strength at the beginning of the readout process. The sensitivity and the dynamic range increased with increasing Fe concentration, and a high sensitivity of 0.12 cm/J and a large dynamic range of 0.53 were obtained in a 0.5 mm-thick crystal. The recording model of the nonvolatile hologram is discussed from the results of light-induced absorption measurements. 2009 Elsevier B.V. All rights reserved.
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