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Picosecond Nonlinear Optical Response Of Three Rugged Polyquinoxaline‐based Aromatic Conjugated Ladder‐polymer Thin Films

X. F. Cao, J. P. Jiang, D. Bloch, R. Hellwarth, Luping Yu, L. Dalton
Published 1989 · Physics

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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.
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