  Pulsed UV lasers can provide useful "testbeams" for observatories that use
optical detectors, especially fluorescence detectors, to measure high energy
cosmic-rays. The light observed by the detector is proportional to the energy
of the laser pulse. Since the absolute laser energy can be measured locally, a
well-calibrated laser offers a practical way to test the photometric
calibration of the cosmic-ray detector including atmospheric corrections. This
poster will describe a robotic system for laser polarization and energy
calibration. Laboratory measurements of laser energies and polarizations by
energy probes from different manufactures will be presented
