When illuminated by an optical source, absorbing impurities in polar crystals produce a macroscopic polarization due to both the change in electric dipole moment from ground to optically excited states and a pyroelectric effect in the host lattice following thermalization of the excitation. The relevance of these mechanisms to relaxation processes is demonstrated by a measurement of the dispersion of optical rectification in LiTaO₃: Cu⁺⁺ over the range of rectified frequencies from 0 to 10¹² Hz.
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Auston et al. (1972) studied this question.
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