Abstract
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 (PMMA) but not in the pure PMMA. The typical superluminal result was -5.1 m/s and the subluminal result was 9.19 m/s, respectively. Furthermore, the results provide a support to our former conclusion that nondegenerate two-wave couplinglike mechanism could be used to change the group velocity of the paraxial part of a focused TEM00 beam in materials with nondegenerate two-wave coupling process.
| Original language | English |
|---|---|
| Article number | 171106 |
| Journal | Applied Physics Letters |
| Volume | 95 |
| Issue number | 17 |
| DOIs | |
| State | Published - 2009 |
| Externally published | Yes |
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