Abstract
An optically induced transient grating in a wide-bandgap dielectric is used to characterize the dispersion of a femtosecond white-light continuum over a 700 nm spectral range and with a time resolution of approximately 20 fs. With this technique, the dependence of the continuum dispersion on the focusing into the nonlinear material is investigated. Implications for laser spectroscopy experiments with continuum pulses are discussed.
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