Abstract

The parallel mirror Series Interferometer exhibits fringes that are qualitatively similar to the well-known multiple-beam fringes of two mirror interference systems. Contrary to the case of two mirror systems, however, no stringent restrictions on mirror separation or monochromatic purity of light source are involved, for the relative path lengths of interfering rays is independent of mirror separation. Thus, sharpened fringes can be employed for applications that require moderately large test zones, such as problems in fluid flow, thermal expansion, optics testing, etc. An experimental verification and analytical treatment are presented. The analysis yields an intensity-fringe order relationship that is effectively corroborated by experimental observations.

© 1958 Optical Society of America

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