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Radial Shear Interferometer


Excerpt from Field Guide to Interferometric Optical Testing

A radial shear interferometer introduces radially symmetric shear by interfering the wavefront with an expanded copy of itself. A large shear gives similar results to a Twyman-Green interferometer, while small shear is a low sensitivity, high-dynamic-range test.

Radial Shear

The resulting interferogram is the same as a Twyman-Green if each aberration coefficient is divided by Radial Shear Interferometer, where n is the radial power of each particular aberration.

Radial Shear Interferometer

Citation:

E. P. Goodwin and J. C. Wyant, Field Guide to Interferometric Optical Testing, SPIE Press, Bellingham, WA (2006).



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