Accurate phase-shifting digital interferometry. 2007

M Atlan, and M Gross, and E Absil
Ecole Normale Supérieure, Laboratoire Kastler-Brossel, UMR 8552 Université Pierre et Marie Curie, Paris Cedex 05, France. atlan@optique.espci.fr

In phase-shifting interferometry experiments, the accuracy of the phase shift is a major issue. Many experimental and data analyses are done to cancel phase-shift errors inherent to the modulation techniques used. We propose to remove most of the phase-shift error by recourse to a frequency-shifting method. This approach can be applied to both holography and interferometry. We validate the idea with a holographic experiment.

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