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Measuring Optics with Spectrally Controlled Interferometry

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Spectrally controlled interferometry, a recent advancement in traditional interferometer technology, improves the manufacture of optics that have multiple flat surfaces.

ROBERT SMYTHE, ÄPRE INSTRUMENTS INC., AND ZACHARY HOBBS, SYDOR OPTICS INC.

Measuring flat and prismatic optics with a traditional laser interferometer is difficult to impossible. Optical engineers, scientists, and technicians struggle to obtain accurate measurements on optics with two or more flat and parallel optical surfaces because of mutually interfering back reflections. This mutual interference can degrade or hinder measurement, making it difficult to tell whether a part meets specification. To suppress back reflections and enable measurements, users have — for more than 50 years — tried work-arounds such as painting, taping, or adding...Read full article

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