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We demonstrate that the quantum mechanical interference between the probability amplitudes for the two-photon absorption of a fundamental (1.55 m)ϳ150 fs pulse and for the one-photon absorption of a noncollinearly propagating second-harmonic ͑775 nm͒ pulse can create transient, ballistic, purely spin-polarized current gratings in bulk GaAs at room temperature. For fundamental and second-harmonic pulses having orthogonal linear polarizations, two periodically modulated ballistic spin-polarizeddoi:10.1063/1.1757033 fatcat:h3fn36rxpbd5tpqfhej7xzuw6u