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Ultrafast dephasing of the plasmonlike longitudinal optical phonon-plasmon coupled ͑LOPC͒ mode in highly doped n-GaAs has been investigated by using a femtosecond optical pump-probe technique with 40 THz bandwidth as a function of photodoping levels. The direct measurement of plasmon damping with the help of a wavelet analysis enables us to extract carrier ͑electron͒ mobility, which decreases with increasing the photodoping levels. It is found that the mobility is suppressed at high photodopingdoi:10.1063/1.3103275 fatcat:2bx4k2gi3bh4heml4lv4uei6ty