1989-01-11
1990-04-17
Bovernick, Rodney B.
350 11, 350394, G02B 504, G02B 718
Patent
active
049174614
ABSTRACT:
An achromatic infrared retarder is described which comprises a substrate supporting an optically reflective surface, two identical prisms of preselected optical material disposed in confronting relationship with the reflecting surface therebetween and defining an optical axis through the prisms along which a light beam is selectably directable, each prism having a first optical surface orientable perpendicular to the optical axis, a second optical surface disposed at a preselected angle to the first surface, and a third optical surface disposed at the preselected angle to the second surface, the angle preselected in size corresponding to the material comprising the prisms in order to provide total internal reflection of a light beam directed along the axis at the second surface, the prisms being disposed so as to define a region bounded by respective third optical surfaces of the prisms and the reflective surface therebetween.
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Bovernick Rodney B.
Callaghan Terry S.
Scearce Bobby D.
Singer Donald J.
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