  We present an extension of the atomic frequency comb protocol that utilizes
the Stark effect to perform noise-free, on-demand, control. An experimental
realization of this protocol was implemented in the Pr$^{3+}$:Y$_2$SiO$_5$
solid-state system, and a recall efficiency of 38\% for a 0.8 $\mu$s storage
time was achieved. Experiments were performed with both bright pulses as well
as weak-coherent states, the latter achieving a signal-to-noise ratio of $570
\pm 120$ using input pulses with an average photon number of $\sim 0.1$. The
principal limitation for a longer storage time was found to be the minimum peak
width attainable for Pr$^{3+}$:Y$_2$SiO$_5$. We employ an adaptation of an
established atomic-frequency comb model to investigate an on-demand,
wide-bandwidth, memory based on Eu$^{3+}$:Y$_2$SiO$_5$. From this we determine
that a storage time as long as 100 $\mu$s may be practical even without
recourse to spin-wave storage.
