Abstract
Four-wave mixing (FWM) is an important holographic technique to study the process of writing and reading of a dynamic grating in a nonlinear medium.1 Recently, several groups have demonstrated a different type of laser- induced dynamic gratings, the so-called optical lattices,2 which can trap atoms in a threedimensional spatial structure. The use of cold atoms to perform FWM is a well-related phenomenon, since in this regime the induced population or polarization gratings by the FWM beams are basically not affected by the atomic motion and this can also lead to a long- lived spatial modulation of some local atomic variables.
© 1998 Optical Society of America
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