  The quantum interference assisted enhanced optical activity due to the
emergence of a steady-state atomic polarization is investigated. The Rubidium
atoms in an antirelaxation coated cell provide a suitable platform to address
the phenomena at multiple Larmors frequencies. It interacts with a narrow
bandwidth frequency comb generated by the frequency modulation of the light
field. The Lindblad master equation with a trichromatic field provides a
microscopic picture of the atomic response to the narrow bandwidth frequency
comb. The directive of the relative phase between the light fields, in the
detuning dependence of the magnetic resonances, is conclusively captured with
the trichromatic field model. The measured absorption, nonlinear magneto-optic
rotation, and their dependencies on various experimental parameters are
analysed. The ellipticity of the light field controls the extent of several
physical processes at multiple Larmors frequencies. The investigation provides
an approach to address the Zeeman coherence in the interaction of a narrow
bandwidth frequency comb with an atomic ensemble and will have applications in
various quantum devices.
