Nonlinear Optical Studies of Newly Synthesized Polythiophenes Containing Pyridine and 1,3,4-Oxadiazole Units

Poornesh, P and Hegde, Pramod K and Manjunatha, M G and Umesh, G and Adhikari, A V (2009) Nonlinear Optical Studies of Newly Synthesized Polythiophenes Containing Pyridine and 1,3,4-Oxadiazole Units. Polymer Engineering and Science. pp. 875-880.

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Abstract

We report measurements of the third-order nonlinear optical properties of a newly synthesized thiophenebased copolymer. The nonlinear transmission measurements were performed on the copolymer dissolved in tetrahydrofuran by employing the single beam Z-scan technique. Q-switched laser output at 532-nm wavelength was used for this purpose. The nonlinear absorption coefficient, b, nonlinear refractive index, n2, and the real and imaginary parts of third-order susceptibility, v(3), were, 18.93 cm/GW, 3.037 3 10�17 m2/W (�1.022 3 10�10 esu), 1.512 3 10�20 m2/V2(�1.080 3 10�12 esu) and 0.399 3 10�20 m2/V2 (0.285 3 10�12 esu), respectively. The excited state absorption crosssection rexc, was found to be larger than the ground state absorption crosssection rg, indicating reverse saturable absorption (RSA) in the copolymer sample. The copolymer exhibits an optical power limiting threshold of about 120 lJ and saturated output of less than 80 lJ. Hence, the copolymer seems to be a promising material for photonic device applications. POLYM. ENG. SCI., 49:875–880, 2009.

Item Type: Article
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 11 Oct 2013 09:06
Last Modified: 11 Oct 2013 09:06
URI: http://eprints.manipal.edu/id/eprint/137444

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