Abstract

The dynamics of coherent phonons in fluorine-containing crystals was investigated by pump-probe technique in the plasma production regime. Several phonon modes, whose frequencies are overtones of the fundamental frequency, were simultaneously observed in a lithium fluoride crystal. Phonons with frequencies of 1 and were discovered in a calcium fluoride crystal and coherent phonons with frequencies of and were observed in a barium fluoride crystal. Furthermore, in the latter case the amplitudes of phonon mode oscillations were found to significantly increase after laser irradiation.

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