Optical frequency measurements of 6s /sup 2/S/sub 1/2/-6p /sup 2/P/sub 3/2/ transition in /sup 133/Cs using an atomic beam and a femtosecond laser frequency comb

High-resolution spectroscopy and a femtosecond laser frequency comb are used to determine the optical frequencies between the components of the D/sub 2/ line in /sup 133/Cs. The accuracy of <10 kHz is 10/spl times/ better than previous results.