Abstract
A compact and practical white-light cross-correlator suitable for fast evaluation of femtosecond optics, in terms of group-delay dispersion, was developed. A 40-W tungsten-halogen lamp was used as a white-light source and the detector selection was made so as to have adequate spectral sensitivity from 600 to 1050 nm, peaked at 800 nm. Group-delay dispersion was obtained, with femtosecond time resolution, from the Fourier transform of the cross-correlation interferogram. The dispersion characteristics of a borosilicate glass plate, broadband femtosecond mirrors, broadband chirped mirrors, and output couplers of different reflectivity have been determined in the wavelength range of 650 to 1050 nm.
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