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Title: Nonlinear optical studies of a newly synthesized copolymer containing oxadiazole and substituted thiophenes
Authors: John, Kiran, A.
Udayakumar, D.
Chandrasekharan, K.
Ahdikari, A.V.
Shashikala, H.D.
Philip, R.
Issue Date: 2007
Citation: Optics Communications, 2007, Vol.271, 1, pp.236-240
Abstract: We investigated the third-order nonlinear optical properties of a newly synthesized soluble copolymer containing oxadiazole and thiophene units using Z-scan and Degenerate Four Wave Mixing (DFWM) techniques. The measurements were performed at 532 nm with 7 ns pulses from a Nd:YAG laser. We found a good agreement between the values of ?(3) determined from both experiments. Z-scan results indicate a negative nonlinear refractive index, n2, whose magnitude is of the order of 10-10 esu. The copolymer exhibits strong nonlinear absorption and good optical limiting properties at 532 nm, and hence may be a potential material for optical limiting applications. 2006 Elsevier B.V. All rights reserved.
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