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In this paper, we present experimental techniques to resolve the closelyspaced hyperfine levels of a weak transition by eliminating theresidual/partial two-photon Doppler broadening and cross-over resonances in awavelength mismatched double resonance spectroscopy. The elimination of thepartial Doppler broadening is based on velocity induced population oscillation(VIPO) and velocity selective saturation (VSS) effect followed by thesubtraction of the broad background of the two-photon spectrum. Since the VIPOand VSS effect are the phenomena for near zero velocity group atoms, thesubtraction gives rise to Doppler-free peaks and the closely spaced hyperfinelevels of the $6\text{P}_{3/2}$ state in Rb are well resolved. The doubleresonance experiment is conducted on$5\text{S}_{1/2}\rightarrow5\text{P}_{3/2}$ strong transition (at 780~nm) and$5\text{S}_{1/2}\rightarrow6\text{P}_{3/2}$ weak transition (at 420~nm) at roomtemperature.

Resolving closely spaced levels for Doppler mismatched double resonance