Quick Shot
Evaluating the Grating Tile
July 14, 2009
Full-aperture interferometry is an essential tool in characterizing large-aperture optics for OMEGA and OMEGA EP components. A grating tile manufactured by Plymouth Grating Laboratory (PGL) is shown being aligned for evaluation on a Zygo 18-in. phase-shifting interferometer and is also seen in the high-reflector, flat mirror.