Due to their stable design, Fizeau interferometers are used to determine the topography of surfaces such as, e.g., plane surfaces. PTB has now developed a method which makes it possible to analyze ...

In order to push the performance of optical systems, aspheric- and freeform surfaces are used in state-of-the-art optic design for correcting aberrations. The production of these complex-shaped ...

IN determining the velocity of light by Fizeau's toothed wheel, the number of eclipses per second cannot be made more than about half a megacycle. Thus the method requires great distances. In two ...