Considerations for selecting a retrosphere in interferometric optical testing of objectives

J. Michael Rodgers

doi:10.1117/12.868876

9 September 2010 Considerations for selecting a retrosphere in interferometric optical testing of objectives

J. Michael Rodgers

Proceedings Volume 7652, International Optical Design Conference 2010; 765216 (2010) https://doi.org/10.1117/12.868876
Event: International Optical Design Conference 2010, 2010, Jackson Hole, WY, United States

Abstract

A retrosphere (either a convex ball or a concave mirror) is a convenient element to use in the interferometric optical test of an objective. However, under some conditions the retrosphere can cause ambiguities in the interferogram due to the effects of Fresnel diffraction. This paper provides diffracted beam propagation analysis and results showing the magnitude of these effects for a range of system f- numbers and retrosphere radii. The paper also presents an alternative retroreflector design concept that avoids the ambiguities.

Citation Download Citation

J. Michael Rodgers "Considerations for selecting a retrosphere in interferometric optical testing of objectives", Proc. SPIE 7652, International Optical Design Conference 2010, 765216 (9 September 2010); https://doi.org/10.1117/12.868876

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