Abstract

Light-induced absorption changes in iron-doped lithium tantalate crystals are generated with ultraviolet nanosecond pulses of a frequency-tripled Nd:YAG laser. The relaxation follows a stretched-exponential function in which the stretching factor is approximately 0.2–0.3. The dependences of the relaxation of the absorption changes on light intensity, temperature, and concentration of the Fe dopant are investigated. A simple model to account for distance-dependent transitions between populated shallow levels and deep traps is proposed to explain the experimental data. The consequences of the results presented are discussed with respect to the application of two-color holography for nonvolatile data storage.

© 2001 Optical Society of America

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