Abstract
The on- and near-resonant third-order nonlinear optical response of polydiacetylene microcrystals in suspension was studied by the Z-scan technique with tunable picosecond pulses. The absorptive and refractive contributions to the excitonic-dominated nonlinearity were fully resolved at several wavelengths. Microcrystals of two different average sizes were studied, and a comparison of their nonlinear coefficients was made. A three-level model for the nonlinear response is presented that shows good agreement with the experimental data. © 1998 Optical Society of America.
| Original language | English |
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| Pages (from-to) | 2937-2945 |
| Number of pages | 9 |
| Journal | Journal of the Optical Society of America B: Optical Physics |
| Volume | 15 |
| Issue number | 12 |
| Publication status | Published - Dec 1998 |