Interferometric Method For Optical Testing And Wavefront Error Sensing

Tapio K. Korhonen

doi:10.1117/12.937983

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3 November 1983 Interferometric Method For Optical Testing And Wavefront Error Sensing

Tapio K. Korhonen

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Proceedings Volume 0444, Advanced Technology Optical Telescopes II; (1983) https://doi.org/10.1117/12.937983
Event: 1983 Astronomy Conferences, 1983, London, United Kingdom

Abstract

A new interferometric method for optical testing has been developed. The test arrangement is similar to that of the Hartmann method using a screen with a rectangular grid of holes. The detection takes place close to the focus where the Hartmann images are partly overlapping and interfering. The positions of the interference maxima contain information on the wavefront errors of the optical system. As the size of the interference maxima is considerably smaller than the size of the Hartmann images obtained with the same screen, the accuracy of the position measurements is respectively better. Also much smaller hole spacing can be used. An application of the method could be wavefront error sensing in active optical systems. A CCD camera could ideally be used as detector for the measurement of the wavefront errors and for generating the error signals to the active optical system.

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Tapio K. Korhonen "Interferometric Method For Optical Testing And Wavefront Error Sensing", Proc. SPIE 0444, Advanced Technology Optical Telescopes II, (3 November 1983); https://doi.org/10.1117/12.937983

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