Influence of the finite aperture and observation of higher longitudinal-order fringes in Fizeau interferometry

The interference pattern of a Fizeau interferometer, ideally a (nearly) self-imaging field, is examined under true measurement conditions. The quality of the higher longitudinal-order fringes is investigated by finite-aperture diffractive calculations. A specific symmetry property of the volume inte...

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Bibliographic Details
Published in:Optical Engineering 1995-09, Vol.34 (9), p.2623-2630
Main Authors: Lauranto, Heikki M, Friberg, Ari T, Kajava, Timo T
Format: Article
Language:English
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Summary:The interference pattern of a Fizeau interferometer, ideally a (nearly) self-imaging field, is examined under true measurement conditions. The quality of the higher longitudinal-order fringes is investigated by finite-aperture diffractive calculations. A specific symmetry property of the volume interference pattern, namely, the invariance of the intensity structure under a rotation of the interferential wedge about its apex, is studied by nondiffractive simulations that take into account the instrument geometry and finite incident wave. The formation of the higher longitudinal-order fringes is verified experimentally. The possibility of transferring these fringes close to the device by a suitable nonnormal incidence is demonstrated. The existence of various fractional Talbot planes is also confirmed. (Author)
ISSN:0091-3286
1560-2303
DOI:10.1117/12.208530