A simple technique for accurate optical alignment

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Abstract
A technique for the accurate alignment of optical systems is described. The technique is a powerful development of the old 'flare spot' method, using a low-powered laser source to project flare spots on to a screen. To a first order of accuracy, the spots are brought into coincidence, whereupon a higher accuracy may be achieved by observing the coherent interference between them. When the alignment condition is reached, the angle between the original beam and the emergent beam is a measure of the overall system tilt and decentration.
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