Abstract
A tuning of the dielectric permittivity spectra of lithium tantalate (LiTaO3) single crystals in an external optical field is investigated at room temperature by means of terahertz time-domain spectroscopy. Application of the optical field leads to an appreciable tuning of the permittivity, which reached up to 7.5%. The observed behavior is interpreted in terms of mode softening due to the anharmonic character of its potential. We also found that the change of refractive index has a linear relationship on scale with the power of the applied light. These findings were attributed to the linear electro-optic effect caused by internal space charge field of the crystal.
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