Abstract

The variable phase system described is characterized by a wide separation of the deviated and the undeviated light bundles so that phase-modifying or absorbing elements can readily be inserted. The path separation is accomplished by a partially aluminized plate inserted in a direction normal to the optical axis, thus facilitating the necessary alignment. Geometrical coincidence has been obtained by introducing into one of the pathways a penta-type mirror system.

© 1960 Optical Society of America

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