Abstract

Femtosecond transient absorption pump–probe spectroscopy has been used to study the third- and fifth-order nonlinear susceptibility of UV-grade fused silica. Theoretical simulations support the experimental evidence of interference between the third- and fifth-order contributions to the signal. Approximate values of the second-order nonlinear refractive index $n_4$ and of the three-photon absorption coefficient $\gamma$ are obtained.

© 2001 Optical Society of America

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