Wave front interferometer

Details Wave front interferometer Wave front interferometer

1992-07-20

1994-08-23

Warden, Robert J.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356360, G01B 1100

Patent

active

053412125

ABSTRACT:
A wave front interferometer for determining the shape of a surface from interference fringes has a light source which projects a light beam through a beam splitter disposed in an optical path between the light source and an optical surface whose shape is to be determined. The beam splitter bends a phase conjugate wave to become incident on the optical surface and to be reflected as a reflected beam. A phase conjugate mirror disposed in the optical path receives the light beam along a beam path through the beam splitter and reflects the light beam as the phase conjugate wave. The phase conjugate mirror reflects the light beam back along the same beam path so that the distance of the focus point of the light beam reflected from the phase conjugate mirror increases as the distance between the light source and the beam splitter and/or the phase conjugate mirror increases, so that either a convex or concave surface having a large radius of curvature can be measured. The reflected beam from the optical surface is effective as a measurement wave for determining the shape of the optical surface.

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