Cascading of second-order processes in quadratic molecular media at the origin of very large cubic effects
| Autor: | Dug Y. Kim, Joseph Zyss, Gary C. Bjorklund, P. Vidakovic, George I. Stegeman, W. Toruellas, Robert J. Twieg, W. E. Moerner |
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| Rok vydání: | 1994 |
| Předmět: |
business.industry
Chemistry Mechanical Engineering Metals and Alloys Condensed Matter Physics Molecular physics Electronic Optical and Magnetic Materials Crystal Nonlinear system Interferometry Optics Quadratic equation Mechanics of Materials Modulation Materials Chemistry Order (group theory) business |
| Zdroj: | Synthetic Metals. 67:303-307 |
| ISSN: | 0379-6779 |
| Popis: | We have shown that very large nonlinear shifts ranging from π/4 to π/2 observed at relatively modest input intensities in single-crystal cored fibers of 4-( N , N -dimethylamino)-3-acetamidonitrobenzene (DAN) have their origin in the cascading of two second-order nonlinear processes: second-harmonic generation followed by down-frequency conversion. The nonlinear shifts and corresponding n 2 values extracted from independent observationsof self-phase modulation and direct interferometric measurements are as large as 10 −12 cm 2 /W at relatively modest input intensities from 30 to 60 MW/cm 2 . The cascading origin of large n 2 values was fully confirmed by z -scan measurements performed on a single DAN crystal. |
| Databáze: | OpenAIRE |
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