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It is demonstrated that velocity selective optical pumping/saturationresonances of reduced absorption in a Rb vapor nanocell with thickness\textit{L=} $\lambda $, 2$\lambda $, and 3$\lambda $ (resonant wavelength$\lambda $ = 780 nm) allow the complete elimination of crossover (CO)resonances. We observe well pronounced resonances corresponding to theF$_{g}=3$ $\to $ F$_{e}=2,3,4$ hyperfine transitions of the $^{85}$Rb D$_{2}$line with linewidths close to the natural width. A small CO resonance locatedmidway between F$_{g}=3$ $\to $ F$_{e}=3$ and F$_{g}=3$ $\to$ F$_{e}=4$transitions appears only for \textit{L} = 4$\lambda $. The D$_{2}$ line($\lambda $ = 852 nm) in a Cs nanocell exhibits a similar behavior. From theamplitude ratio of the CO and VSOP resonances it is possible to determine thethickness of the column of alkali vapor in the range of 1 - 1000 $\mu $m. Theabsence of CO resonances for nanocells with $L \sim \lambda $ is attractive forfrequency reference application and for studying transitions between Zeemansublevels in external magnetic fields.

Saturated absorption spectroscopy: elimination of crossover resonances by use of a nanocell