Measurement systems for optical surfaces that lack axisymmetry are notoriously difficult to align and have limited accuracy. This paper describes a technique that uses a single CGH to act as null lens for measuring the aspheric surface, at the same time as it projects alignment marks into space that can be used for aligning the test. By providing reference features and the surface shape on the same hologram, we ensure accurate alignment. This method can also be used for aligning systems with multiple surfaces.

© 2002 Optical Society of America

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