Abstract

A prism coupler jig is described which enables a coupling region to be quickly and easily found when the waveguide is a thin film on a microscope slide. Interference fringes formed on reflection allow observation of the air gap. Consideration is given to the formation of white light and quasi-monochromatic interference fringes. A suitable choice of the refractive index of the right-angle prism enables the m lines to be observed in a convenient observation space.

© 1982 Optical Society of America

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