Hans Wolter (1911–1978) was a German physicist who designed an aplanatic system of grazing incidence mirrors that satisfied the Abbe sine condition (i.e. free of both spherical aberration and coma). Wolter showed such a system could be produced using a combination of a paraboloid with either a hyperboloid or ellipsoid secondary. The three simplest designs are outlined and are known as Wolter telescopes of types I, II and III.
- Wolter, H. (1952). "Glancing Incidence Mirror Systems as Imaging Optics for X-rays". Ann. Physik 10: 94. Bibcode:1952AnP...445...94W. doi:10.1002/andp.19524450108.