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We investigated the absence of certain bright peaks in Autler-Townes laserexcitation spectra of alkali metal atoms. Our research revealed that these dipsin the spectra are caused by a specific architecture of adiabatic (or``laser-dressed'') states in hyperfine (HF) components. The dressed states'analysis pinpointed several cases where constructive and destructiveinterference between HF excitation pathways in a two-photon excitation schemelimits the available two-photon transitions. This results in a reduction of theconventional two-photon selection rule for the total angular momentum $F$, from$\Delta F= 0,\pm 1$ to $\Delta F\equiv 0$. Our discovery presents practicalmethods for selectively controlling the populations of unresolvable HF$F$-components of $ns_{1/2}$ Rydberg states in alkali metal atoms. Usingnumerical simulations with sodium and rubidium atoms, we demonstrate that byblocking the effects of HF interaction with a specially tuned auxiliary controllaser field, the deviations from the ideal selectivity of the HF componentspopulation can be lower than $0.01\%$ for Na and $0.001\%$ for Rb atoms.

Hyperfine interaction in the Autler-Townes effect II: control of two-photon selection rules in the Morris-Shore basis