Third-order nonlinear optical studies of newly synthesized polyoxadiazoles containing 3,4-dialkoxythiophenes

The third-order nonlinear optical properties of newly synthesized soluble polyoxadiazoles containing 3,4-dialkoxythiophenes were investigated by 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...

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Bibliographic Details
Published in:Chemical physics 2006-12, Vol.331 (1), p.125-130
Main Authors: Udayakumar, D., John Kiran, A., Adhikari, A. Vasudeva, Chandrasekharan, K., Umesh, G., Shashikala, H.D.
Format: Article
Language:English
Subjects:
Conjugated polymers
DFWM
Nonlinear optics
Optical limiting
Z-scan
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Summary:The third-order nonlinear optical properties of newly synthesized soluble polyoxadiazoles containing 3,4-dialkoxythiophenes were investigated by 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 χ (3) determined from both the experiments. Z-scan results indicate a negative nonlinear refractive index, n 2, whose magnitude is of the order of 10 −10 esu for all the copolymers. The variation of nonlinear response among the copolymers clearly indicates the dependence of χ (3) on donor and acceptor type of units present in these copolymers. The copolymers exhibit strong reverse saturable absorption and good optical limiting properties at 532 nm.
ISSN:0301-0104
DOI:10.1016/j.chemphys.2006.10.001