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Interferometry using binary holograms without high order diffraction effects
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DOI：10.1364/OL.36.002357.png)
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Abstract
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We describe a technique for a phase-stepping interferometer based on programmable binary phase holograms, particularly useful for optical testing of aspheric or free-form surfaces. It is well-known that binary holograms can be used to generate reference surfaces for interferometry, but a major problem is that cross talk from higher diffraction orders and aliasing can reduce the fidelity of the system. Here, we propose a new encoding technique which improves the accuracy of the technique and demonstrate its implementation using a binary liquid crystal spatial light modulator. (C) 2011 Optical Society of America
Keywords:
SPATIAL LIGHT-MODULATOR
SYSTEMS
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