Abstract
We demonstrate a Fourier spectrometer that uses intense ultrashort laser pulses. By exciting the – two-photon transition in atomic cesium vapor, we are able to measure the small hyperfine splitting of the 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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