Abstract

We present time-resolved measurements of low-frequency nonsymmetric phonon polaritons driven impulsively in perovskite crystals. The definition of the phonon wave vector as a function of the excitation wavelength is addressed for the case of one and two pump beams. Results obtained with KNbO₃ and PbTiO₃ for B₂ and E symmetry modes, respectively, are presented, and the value of the lowest wave vector that can be reached for a specific wavelength of the pump beams is discussed.

© 1996 Optical Society of America

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