Abstract

A modified Ronchi test with an extended source is presented. By the use of a matched pair of source grating and Ronchi grating, a pure shearogram between two shifted wave fronts is obtained, and the extra interference with other disturbing grating orders is largely suppressed by the use of a specific grating layout.

© 1999 Optical Society of America

Fringe contrast interpretation for an extended source Ronchi test

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