Experimental observation of subluminal and superluminal light propagation in rhodamine 6G-doped polymethyl methacrylate

[摘要]：Nondegenerate two-wave coupling process and group velocity change in the paraxial part of an intensity-modulated and focused transverse electromagnetic beam (TEM00 beam in the article) was observed in the rhodamine 6G(R6G)-doped polymethyl methacrylate (P

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