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We report on the control of coherent longitudinal-optical phonon decay in GaAs by using an additional carrier pump in femtosecond pump-probe measurements. A suppression of the coherent phonon amplitude via the carrier-phonon interaction, which is launched by using photo-excitation of the carrier pump, is demonstrated. Phonon decay controls were achieved by adjusting the intensity and the relative timing of the carrier pump pulse.


We report on the control of coherent longitudinal-optical phonon decay in GaAs by using an additional carrier pump in femtosecond pump-probe measurements. A suppression of the coherent phonon amplitude via the carrier-phonon interaction, which is launched by using photo-excitation of the carrier pump, is demonstrated. Phonon decay controls were achieved by adjusting the intensity and the relative timing of the carrier pump pulse.