Abstract
In LiNbO 3:Fe,Me (Me = K, Mg, Zn) holograms are recorded and erased with frequency-doubled pulses of a Q-switched Nd:YAG laser. At high light intensities contributions of higher order to the holographic quantities appear. Effects are diminished by increasing the lithium content of the crystals or by doping with magnesium or zinc. All results can be described by a two-center model, which is the Fe 2+/3+ model supplemented by shallow traps, namely niobium ions occupying lithium sites.
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