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Large pure refractive nonlinearity of SiO2 aerogel at near infrared wavelength

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Abstract

Nonlinear refraction coefficient of the third-order susceptibility of silica aerogel was estimated to be ~ -1.5 × 10−15 m2/W (~-3.67 × 10−9 esu) by a signal-beam z-scan technique with ~1 ps Ti:Sapphire lasers. The large nonlinear refraction is originated mainly from the direct excitation to the surface trapped states, and the one-photon resonance process.

© 2002 Optical Society of America

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