Second harmonic generation study of field-induced changes in the phase transition of K1-xLixTaO3

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Abstract
The phase transition in K1−xLixTaO3 with x=0.036 and x=0.063 has been investigated using optical second harmonic generation (SHG). The application of an electric field during cooling and heating shifts the phase transition to higher temperatures and increases the intensity of the frequency doubled light drastically. This can be interpreted as an increased mean size of ordered regions in the low-temperature domain state by the electric field. The shape of the tensor of the nonlinear susceptibility corresponds to a polar tetragonal low temperature symmetry. The temporal dependence of the SHG intensity upon application of an electric field yields an activation energy similar to that for the Li reorientation.

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