  We present a liquid-crystal laser device based on the chiral ferroelectric
nematic phase (NF*). The laser medium is obtained by mixing a ferroelectric
nematic material with a chiral agent and a small proportion of a fluorescent
dye. Notably, in the NF* phase very low electric fields perpendicular to the
helical axis are able to reorient the molecules, giving rise to a periodic
structure whose director profile is not single harmonic but contains the
contribution of various Fourier components. This feature induces the appearance
of several photonic bandgaps whose spectral ranges depend on the field, which
can be exploited to build tunable laser devices. Here we report the
characterization of home-made NF* lasers that can be tunable under low electric
fields and present laser action in two of the photonic bands of the material.
The obtained results open a promising route for the design of new and more
versatile liquid-crystal based lasers.
