Abstract
We investigate the low-frequency dielectric response of the ferroelectrics LiTaO3 and LiNbO3 via the impulsive excitation and phase-sensitive detection of THz phonon polaritons. The low-frequency dielectric response of these crystals is dominated by a ferroelectric mode of Ai symmetry. This mode leads to a strong absorption at 6 THz (200 cm−1) in LiTaO3 and to a strong absorption at 7.5 THz (250 cm−1) in LiNbO3 at room temperature The strength and frequency of this mode strongly change when the temperature is increased towards the ferroelectric phase-transition temperature (890 K for LiTaO3 and 1480 K for LiNbO3).
© 1994 Optical Society of America
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