Abstract
We report the observation of transient Bragg diffraction by an optical-pumping-transferred ground-state population grating in cold cesium atoms confined in a magneto-optical trap. The measurement of the grating decay time gives direct access to the temperature of the cold sample. In principle, the method can be employed to provide directional information on the trap velocity distribution. For strong excitation the transferred grating becomes anharmonic and higher-order diffraction is observed.
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