Electromagnetically induced grating (EIG) is a phenomenon that occurs in certain quantum systems, such as in atomic or molecular gases, where coherence between quantum states leads to the formation of a periodic modulation of the refractive index. This effect can be induced by electromagnetic fields, typically laser light. The basic idea of EIG involves the interaction of multiple laser fields with a medium, which can lead to the creation of a grating pattern in the dielectric response of the medium.
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