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We propose ultranarrow dynamical control of population oscillation (PO)between ground states through the polarization content of an input bichromaticfield. Appropriate engineering of classical interference between optical fieldsresults in PO arising exclusively from optical pumping. Contrary to theexpected broad spectral response associated with optical pumping, we obtainsubnatural linewidth in complete absence of quantum interference. Theellipticity of the light polarizations can be used for temporal shaping of thePO leading to generation of multiple sidebands even at low light level.

Dynamical control of atoms with polarized bichromatic weak field