Abstract
Picosecond laser pulses have been used to excite dense electron-hole plasmas in GaAs and to probe the dynamics of the plasmas by time- resolved Raman scattering from single particle excitations. The Raman lineshapes are explained by a theory which includes the electron collision time. For a plasma with density of 5 × 10 18 cm −3 the collision time is found to be about 20 femtoseconds.
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