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Heterodyne interferometry is a technique for measuring directly the optical path difference between two wavefronts. In contrast to traditional interferometry, there are no fringe maps to reduce. Other features of the technique include a phase accuracy of better than λ/100, high spatial resolution, and application to dynamic optical phenomena.
interferograms, heterodyne interferometry, optical phase measurement
Technical staff member, Rockwell International, Canoga Park, Calif.