A 180° rotation shearing interferometer with increased optical efficiency |
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| Authors: | A.H Greenaway C Roddier |
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| Affiliation: | Department d''Astrophysique de l''I.M.S.P., E.R.A. 669 du C.N.R.S., Université de Nice, 06034 Nice Cedex, France |
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| Abstract: | Use of a rotating wedge-shaped mirror rather than a rotating prism gives a higher throughput rotation shearing interferometer. The new interferometer has polarization problems if the shear differs from 0° or 180°. However, for the commonly used 180° shear, the new interferometer offers a 4-fold reduction in time required for observations employing short-exposure sequences. |
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