Abstract

An unequal-arm Mach–Zehnder interferometer has been developed in which interference fringes are formed as a result of the passage of a nonparallel homocentric pencil of rays through the interferometer. The scale of the interference fringes relative to the test object or the optical inhomogeneities is controlled by simply replacing the lens of the coherent illuminating system or by displacing the object in the arm of the interferometer. This allows the interferometer to be made in the form of a monolithic structure. A technique is proposed for using the interferometer to determine the change of the optical thickness of dichroic liquid-crystal transparencies when they are switched by an external electric field.

© 2015 Optical Society of America

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