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Focusing Errors in a Collimating Lens or Mirror: Use of a Moiré Technique

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Abstract

The Fresnel diffraction pattern of a grating periodically gives an exact reproduction of the grating. By superposing a second grating on such an image, we form a Moiré pattern that depends upon the degree of parallelism of the incident beam. We present here the possibility of using this technique for studying the focusing errors in a collimating lens or a mirror.

© 1974 Optical Society of America

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