Abstract

A simple and very sensitive method for determining refractive and absorptive nonlinearities based on spectral resolution of two-beam coupling is demonstrated. Nonlinear phase shifts as small as ~10<sup>-6</sup> rad and two-photon absorption coefficients as small as 10<sup>-4</sup> cm/GW are readily observed by use of this technique with nanojoule pulses from a mode-locked laser.

© 1997 Optical Society of America

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