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Title of Journal: Appl Phys B

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Abbravation: Applied Physics B

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Springer-Verlag

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DOI

10.1007/bf00553919

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1432-0649

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Studies on thirdorder nonlinear optical propertie

Authors: P Poornesh G Umesh P K Hegde M G Manjunatha K B Manjunatha A V Adhikari
Publish Date: 2009/07/21
Volume: 97, Issue: 1, Pages: 117-124
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Abstract

We report here the studies on thirdorder nonlinear optical properties of two novel polythiophene composite films investigated using the Zscan technique The measurements were carried out using a Qswitched frequency doubled NdYAG laser producing 7 nanosecond laser pulses at 532 nm Zscan results reveal that the composite films exhibit selfdefocusing nonlinearity The real and imaginary parts of the thirdorder nonlinear optical susceptibility were of the order 10−12 esu The effective excitedstate absorption cross section was found to be larger than the ground state absorption cross section indicating that the operating nonlinear mechanism is reverse saturable absorption RSA The polythiophene composite films also exhibit good optical power limiting of the nanosecond laser pulses The nonlinear optical parameters are found to increase on increasing the strength of the electrondonor group indicating the dependence of χ 3 on the electrondonor/acceptor units of polythiophenes

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