The advantages and construction of Schwarzschild objectives
Schwarzschild objectives are increasingly used in the EUV spectral region as imaging optics because of their large aperture, high mechanical stability, and freedom from chromatic aberrations. An EUV Schwarzschild objective is made of a primary and a secondary Mo/Si coated multilayer mirror, on which both spheres and aspheres can be used. The optical elements are stress-free and were mounted mechanically stable using solid state hinges. It is possible to correct the mirror adjustment during operation.