  We theoretically study the electric pulse-driven non-linear response of
interacting bosons loaded in an optical lattice in the presence of an
incommensurate superlattice potential. In the non-interacting limit $(U=0)$,
the model admits both localized and delocalized phases depending on the
strength of the incommensurate potential $V_0$. We show that the particle
current contains only odd harmonics in the delocalized phase in contrast to the
localised phase where both even and odd harmonics are identified. The relative
magnitudes of these even and odd harmonics and sharpness of the peaks can be
tuned by varying frequency and the number of cycles of the applied pulse,
respectively. In the presence of repulsive interactions, the amplitudes of the
even and odd harmonics further depend on the relative strengths of the
interaction $U$ and the potential $V_0$. We illustrate that the disorder and
interaction-induced phases can be distinguished and characterized through the
particle current. Finally, we discuss the dynamics of field induced excitation
responsible for exhibiting higher harmonics in the current spectrum.
