  The polarization control of micro/nano lasers is an important topic in
nanophotonics. Up to now, the simultaneous generation of two distinguishable
orthogonally-polarized lasing modes from a single organic microlaser remains a
critical challenge. Here, we demonstrate simultaneously orthogonally-polarized
dual lasing from a microcavity filled with an organic single crystal exhibiting
selective strong coupling. We show that the non-Hermiticity due to
polarization-dependent losses leads to the formation of real and imaginary
Fermi arcs with exceptional points. Simultaneous orthogonally-polarized lasing
becomes possible thanks to the eigenstate mixing by the photonic spin-orbit
coupling at the imaginary Fermi arcs. Our work provides a novel way to develop
linearly-polarized lasers and paves the way for the future fundamental research
in topological photonics, non-Hermitian optics, and other fields.
