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Wavelength dependence and figures of merit of ultrafast third-order optical nonlinearity of a conjugated 3,3′-bipyridine derivative

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Abstract

The wavelength dependence and figures of merit of the third-order optical nonlinearity of a conjugated 3,3′-bipyridine derivative, a designed nondipolar structure of the donor-acceptor-acceptor-donor type, are reported. Z scans reveal positive nonlinear refractive-index changes for wavelengths longer than the one-photon absorption wavelength. Although the value of nonlinear Kerr coefficient n 2 decreases from 6.0(±0.2) × 10-6 cm2/GW at 750 nm to 4.6(±0.7) × 10-6 cm2/GW at 1550 nm, the value of nonlinear absorption β decreases from 0.084 cm/GW at 750 nm to a negligible value at 1550 nm, giving rise to excellent nonlinearity-to-loss figures of merit at telecommunications wavelengths.

© 2003 Optical Society of America

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