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Ultraviolet-light-induced absorption changes in highly Zn-doped LiNbO(3).

Ultraviolet-light-induced absorption (UVLIA) in a highly Zn-doped LiNbO(3) crystal is studied at room temperature with various probe wavelengths from the violet to the near-infrared spectral regions. Transient dark buildup of UVLIA is observed in the violet-blue (<500 nm) region, while such a phenomenon is yet absent in the green-red (>500 nm) region. It is found that the temporal evolution of UVLIA in the dark is well described by a sum of two stretched exponential functions. These results are explained in terms of a three-level model involving two types of hole-trapped O- levels and one unintentional impurity FeLi level.