Abstract

We demonstrate a Fourier spectrometer that uses intense ultrashort laser pulses. By exciting the $6S_{1/2}$–$8S_{1/2}$ two-photon transition in atomic cesium vapor, we are able to measure the small hyperfine splitting of the $8S_{1/2}$ excited state. This technique, combining a high spectral resolution with the high peak intensities available to femtosecond laser systems, may offer intriguing opportunities for the study of multiphoton transitions and for spectroscopy in the short-wavelength region.

© 1997 Optical Society of America

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