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Summary form only given. We have performed amplitude and spin gratings on room temperature InGaAsP multiple quantum wells at 1.52 /spl mu/m. We present our results for the spin grating using a mathematical model taking into account the spin relaxation and electron diffusion. Polarization gratings are produced when two pulses with crossed linear polarization intersect. A periodic modulation of the electric field polarization and circular polarization occurs across the excitation region. Resonance with the heavy hole exciton creates an electron spin grating because of the interband selection rules. This will decay with a rate determined by a combination of the spin relaxation rate and the diffusion of the carriers within the quantum wells.