Near-resonant third-order optical nonlinearities in p-toluene sulfonate polydiacetylene
- 1 September 1992
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America B
- Vol. 9 (9) , 1552-1557
- https://doi.org/10.1364/josab.9.001552
Abstract
We report single-wavelength subpicosecond and nanosecond excite-probe and four-wave mixing experiments near the exciton resonance in p-toluene sulfonate polydiacetylene. Contributions to the third-order susceptibility χ(3) resulting from phase-space filling, photoinduced absorption, and two-photon absorption are identified. A three-level rate-equation model that accounts for the change in sign of the nonlinear absorption observed at near-resonant frequencies is discussed.Keywords
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