  Organic semiconductors are a promising platform for ambient polaritonics.
Several applications, such as polariton routers, and many-body condensed matter
phenomena are currently hindered due to the ultra-short polariton lifetimes in
organics. Here, we employ a single-shot dispersion imaging technique, using 4
nanosecond long non-resonant excitation pulses, to study polariton lasing in a
$\lambda/2$ planar organic microcavity filled with BODIPY-Br dye molecules. At
a power threshold density of $1.5 MW/cm^{2}$, we observe the transition to a
quasi-steady state, 1.2 ns long-lived, single-mode polariton lasing and the
concomitant superlinear increase of photoluminescence, spectral line-narrowing,
and energy blueshift
