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Influence of cascading phenomena on a type I second-harmonic wave generated by an intense femtosecond pulse: application to the measurement of the effective second-order coefficient

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Abstract

We have studied the influence of cascaded second-order effects on the spectral density of a second-harmonic pulse generated in thin KDP and β-barium borate crystals by an intense femtosecond pulse. A noticeable evolution of spectral density is recorded for any value of phase mismatch. This evolution is in good agreement with the solution of the nonlinear propagation equation and allows a simple direct measurement of the effective susceptibility of the studied crystals.

© 1998 Optical Society of America

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