Abstract
The use of femtosecond optical pulses is known to drive low frequency nuclear motions of materials, as far as they lie in the spectral range covered by the pump pulses spectral width.1,2 When using a phase matched folded boxcar configuration, application of this process to noncentrosymmetric solids allows direct access to the polariton regime. Figure 1 reveals the main features obtained on a single domain tetragonal PbTiO3 crystal.3 The experimental characteristics were as follows: wp is the pump pulse wavelength located at 620 nm and wt is the probe pulse at 650 nm; the angle between the pump beams inside the sample is 0.6°.
© 1990 Optical Society of America
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