Quick Shot

Optical Manufacturing metrology technician, Hope D’Alessandro, is seen evaluating the wavefront performance of a large laser component. The optical testing is accomplished using a Zygo 18-in. aperture interferometer. The software displays the surface topography of the tested sample with colored maps, which illustrate the imperfections from a flat surface. This interferometric test is an essential step to validate the reflected wavefront specification of coated optics destined for laser systems such as OMEGA, OMEGA EP, the NIF, and at CEA. The application of a thin-film coating has the potential to significantly change the surface flatness of a finished part, and documenting that final coated result is important to both qualify the component for use on the laser system as well as to help us understand and quantify the impact of the coating process.