  UV lasers for the calibration of gaseous detectors have seen newfound
employment with current-generation micro-pattern gaseous detectors (MPGDs),
especially those devices not suitable for tests with traditional sources (e.g.
cosmic rays or X-ray beams) by design constraints. An apparatus made of a UV
laser designed for the characterization of the fast timing MPGD (FTM) is here
described, together with the measurements of gain curve and electron drift
velocity performed on a prototype of Time Projection GEM (TPG) to validate the
setup.
