Abstract
In the present experiment the 5S‐5D two‐photon transitions in 85Rb and 87Rb atoms as a result of the interaction of the femtosecond frequency comb with atomic levels of both rubidium isotopes are investigated. The main problem in studying of two‐photon transitions is in optimization of the excitation efficiency of the desired state. There are two general cases: those transition with an intermediate resonance those in which the pulse spectrum is far detuned from an intermediate resonance. In order to investigate the dependence of the two‐photon fluorescence signal as a result of interaction of the frequency comb with perturbed energy‐level pattern an external magnetic field was applied.
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