Determination of real and imaginary part of χ (3) of thiophene oligomers using the z-scan technique

Using the single beam z-scan technique with 30 ps pulses at 532 nm (close to the linear absorption region) the values of real and imaginary part of third-order optical nonlinear susceptibility χ (3) in solutions of thiophene oligomers have been determined for different numbers of repeat units ( n=2–...

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Bibliographic Details
Published in:Chemical physics 1994-02, Vol.179 (3), p.543-548
Main Authors: Hein, J., Bergner, H., Lenzner, M., Rentsch, S.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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Summary:Using the single beam z-scan technique with 30 ps pulses at 532 nm (close to the linear absorption region) the values of real and imaginary part of third-order optical nonlinear susceptibility χ (3) in solutions of thiophene oligomers have been determined for different numbers of repeat units ( n=2–6). The values of the real part of χ (3) were found to be negative, the contribution of each repeat unit to this value increases with increasing chain length. In solutions of dioxane (10 −3 mol/ℓ) we measured n 2 values in the order of 10 −13 esu, whereas two-photon absorption coefficients of about 0.1 cm/GW were found.
ISSN:0301-0104
DOI:10.1016/0301-0104(94)87029-2