  It has recently been shown that the polarization of a ferroelectric can be
strongly affected by light pumping or even transiently reversed by mid-IR
pumping within a record short subpicosecond timescale. It was then suggested
that the reversal of polarization is most likely prevented by the depolarizing
field that appears during the process. To minimize the effect of the
depolarizing field, I propose to create an elongated domain by choosing a
corresponding pump spot shape. I calculate the polarization dynamics for a
particular experimental setup with mid-IR pumping and show that the
polarization reversal is possible in this case.
