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Proceedings Paper

Z-scan measurements on substituted thiophene oligomers
Author(s): Paul A. Fleitz; Richard L. Sutherland; Nansheng Tang; W. Li; Luping Yu
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Paper Abstract

The nonlinear optical properties of a series of substituted thiophene oligomers have been investigated using the Z-scan technique. As the length of the thiophene increases from the monomer to an oligomer containing nine thiophene units, the absorption spectrum shifts to longer wavelength. This shift in wavelength moves the absorption band into resonance with the laser wavelength and the nonlinear optical properties of these materials change. In the samples where there is no linear absorption at the laser wavelength, the nonlinear absorption appears to originate from a two-photon absorption process. The nonlinear refraction observed is dominated by the contributions of the solvent. In the samples where there is linear absorption at the laser wavelength, several competing mechanisms appear to be responsible for the nonlinear response observed. At low laser irradiance, saturable absorption is observed. As the laser irradiance is increased, a decrease in the transmitted energy is observed. The nonlinear refraction in these materials is now large and negative.

Paper Details

Date Published: 7 October 1996
PDF: 9 pages
Proc. SPIE 2853, Nonlinear Optical Liquids, (7 October 1996); doi: 10.1117/12.253478
Show Author Affiliations
Paul A. Fleitz, Science Applications International Corp. (United States)
Richard L. Sutherland, Science Applications International Corp. (United States)
Nansheng Tang, Air Force Wright Lab. (United States)
W. Li, Univ. of Chicago (United States)
Luping Yu, Univ. of Chicago (United States)

Published in SPIE Proceedings Vol. 2853:
Nonlinear Optical Liquids
Christopher M. Lawson, Editor(s)

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