We believe that metrology equipment is equally as important as fabrication and coating equipment.  Metrology is critical not only because it validates the finished specifications but it also aids in our fabrication and coating process. Our fleet of Zygo interferometers, each with its own set of reference spheres and flats, are mounted vertically on our proprietary enclosed stands or mounted horizontally on isolation pads.  For surface measurement we also have an extensive inventory of test plates.  We also have several Perkin Elmer spectrophotometers, and a Cary spectrophotometer for measuring wavelengths into the DUV.