Journal
OPTICS LETTERS
Volume 36, Issue 12, Pages 2357-2359Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.002357
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- Science and Technology Facilities Council [ST/G001251/1] Funding Source: researchfish
- STFC [ST/G001251/1] Funding Source: UKRI
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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
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