Interaction of laser radiation with matter
Resonance laser-plasma excitation of coherent terahertz phonons in the bulk of fluorine-bearing crystals under high-intensity femtosecond laser irradiation
F. V. Potemkinab, E. I. Mareevab, P. M. Mikheev, N. G. Khodakovskiic
a Faculty of Physics, Lomonosov Moscow State University
b International Laser Center of Moscow State University
c Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
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 0.38-THz fundamental frequency, were simultaneously observed in a lithium fluoride crystal. Phonons with frequencies of 1 and 0.1 THz were discovered in a calcium fluoride crystal and coherent phonons with frequencies of 1 THz and 67 GHz were observed in a barium fluoride crystal. Furthermore, in the latter case the amplitudes of phonon mode oscillations were found to significantly increase 15 ps after laser irradiation.
femtosecond laser-produced microplasma, third harmonic generation, coherent phonons.
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Quantum Electronics, 2013, 43:8, 735–739
63.20.dd, 52.50.Jm, 42.65.Ky, 42.65.Re
F. V. Potemkin, E. I. Mareev, P. M. Mikheev, N. G. Khodakovskii, “Resonance laser-plasma excitation of coherent terahertz phonons in the bulk of fluorine-bearing crystals under high-intensity femtosecond laser irradiation”, Kvantovaya Elektronika, 43:8 (2013), 735–739 [Quantum Electron., 43:8 (2013), 735–739]
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