Picosecond Raman scattering from photoexcited plasmas in InP with spatial and temporal resolution

Picosecond, time-resolved Raman scattering spectra from photoexcited plasmon-phonon modes in semi-insulating InP are presented. Spectra of plasmas ranging in density from 0.1×${10}^{17}$ to 5.0×${10}^{17}$ ${\mathrm{cm}}^{\mathrm{-}3}$ are quantitatively fitted by extending equilibrium n-type plasmon-phonon scattering theories to include contributions from free holes. A novel application of time-resolved Raman scattering to measure the ambipolar diffusion coefficient and surface recombination velocity of nonequilibrium semiconductor plasmas is demonstrated.