  Photon statistical measurements on a semiconductor microlaser, obtained using
single-photon counting techniques, show that a newly discovered spontaneous
pulsed emission regime possesses superthermal statistical properties. The
observed spike dynamics, typical of small-scale devices, is at the origin of an
unexpected discordance between the probability density function and its
representation in terms of the first moments, a discordance so far unnoticed in
all devices. The impact of this new dynamics is potentially large, since
coincidence techniques are presently the sole capable of characterizing light
emitted by nanolasers.
