Picosecond nonlinear optical response of three rugged polyquinoxaline-based aromatic conjugated ladder-polymer thin films
- 15 June 1989
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 65 (12) , 5012-5018
- https://doi.org/10.1063/1.343174
Abstract
We have fabricated the first optical quality polymer films of aromatic ladder polymers having an unbroken conjugated backbone, and find third-order nonlinear susceptibilities two orders of magnitude larger than CS2. The nonlinearities respond in less than 6 ps. Although we find their space symmetry to agree with that expected for a nonresonant electronic nonlinearity, the mechanism may well depend on lattice motion. The polymers are stable and rugged at room temperature. We also develop and analyze a simple form of degenerate four-wave mixing for the measurements, finding expressions for the effects of uncertainties in the spatial and temporal pulse profiles.This publication has 14 references indexed in Scilit:
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