title: Continuous-wave Doppler-free two-photon frequency-modulation spectroscopy in Rb vapor.
abstract: Frequency-modulation spectroscopy was employed successfully to measure the Doppler-free absorption and dispersion signals originating from several two-photon transitions in (85)Rb and (87)Rb. The two-photon cross section of the hyperfine transition 5S(1/2) (F = 2) ? 5D(5/2) (F = 4) in (87)Rb was determined to be sigma((2)) asymptotically equal to 4 x 10(-20) cm(4)/W. The transition isotope shift (TIS) of the transition 5S(1/2) ? 5D(5/2) between (87)Rb and (85)Rb was found to be Deltanu(TIS) = +166 +/- 2 MHz.
authors.forename: W
authors.initials: W
authors.lastname: Zapka
authors.forename: M D
authors.initials: MD
authors.lastname: Levenson
authors.forename: F M
authors.initials: FM
authors.lastname: Schellenberg
authors.forename: A C
authors.initials: AC
authors.lastname: Tam
authors.forename: G C
authors.initials: GC
authors.lastname: Bjorklund