Nonlinear Optical Properties of a Soluble Form of Polyisothionaphthene
- 1 June 1994
- journal article
- research article
- Published by Taylor & Francis in Journal of Modern Optics
- Vol. 41 (6) , 1217-1225
- https://doi.org/10.1080/09500349414551151
Abstract
The third-order nonlinearity of a low-bandgap conjugated organic polymer has been assessed. Degenerate four-wave mixing experiments (at 1·064 μm using picosecond pulses from a passively mode-locked neodymium-doped yttrium aluminium garnet laser) on solutions of the polymer have permitted the determination of the microscopic third-order nonlinearity γ. The polymer exhibits unusual behaviour which is solution concentration dependent. This behaviour is thought to be due to aggregation effects and strongly suggests that the bulk response of the material is large, the third-order nonlinearity being of the order of ten times greater than that of polythiophene.Keywords
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