Abstract
Time-resolved four-wave mixing in dc-biased GaAs crystals exhibit GHz frequency oscillations when the applied dc field and nonequilibrium carrier density are high enough to form a photorefractive high-field domain grating. Its propagation through the spatially modulated carrier density structure creates a photorefractive space-charge wave and leads to an oscillatory behavior of the probe-beam diffraction efficiency with period T=Λ/ν≈200 ps, determined by the grating spacing Λ and domain drift velocity ν. Formation of the space-charge wave in dc-biased GaAs was verified experimentally by using a picosecond transient grating technique. The experimental data were found to be in good agreement with numerical calculations based on the hot electron hydrodynamic model.
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