  The single photoelectron performance characteristics of a Large Area
Picosecond PhotoDetector (LAPPD) were studied using a picosecond optical laser
source. We verify that the LAPPD is capable of achieving transit time spreads
of less than 70 ps and spatial resolutions on the order of millimetres when
illuminated with single photons. Isolation of the single photoelectron peak is
easily possible in the pulse height distribution and the mean single
photoelectron gain is measured to be greater than $10^{6}$ with gains above
$10^{7}$ possible in certain voltage configurations. We judge the performance
of the LAPPD sufficient for application in large-scale water or
scintillator-based neutrino experiments, with additional work required to
develop the digital signal processing algorithms necessary for processing
photon hits in high photon occupancy environments.
