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Plotting Errors Measurement in CGH Using an Improved Interferometric Method

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Abstract

Computer generated holograms1 (CGH) are very useful to test aspherical lenses or mirrors. Accurately drawn CGH's are required to test precisely. J.C. Wyant et al presented an interferometric method2 that can measure plotting errors of equispace straight lines or dots in CGH's. In the interferometric method, an original pattern drawn by the plotter has to be reduced to a small photo-film. The measured plotting error must then include an error caused by a photo lens aberration.

© 1984 Optical Society of America

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