MWIR polarizing beamsplitter cube and method of making the same
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United States of America Patent
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Apr 3, 2001
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app pub date -
Sep 29, 1998
filing date -
Sep 29, 1997
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Abstract
A polarizing beamsplitter cube, such as for midwave infrared spectral applications, comprises two ZnSe 45.degree. prisms, an adhesion layer and a thin-film polarization coating layer that are deposited onto the hypotenuse of the first prism, a refractive index liquid layer that provides an interface between the prisms that defeats total internal reflection when the prisms are joined together, and a urethane adhesive that permanently seals and encapsulates the liquid. The adhesion layer consists of 100 .ANG. thorium fluoride and 50 .ANG. chromium layers. The polarization coating (PC) comprises alternating layers of zinc sulfide (ZnS) and germanium (Ge) which are deposited by vapor deposition.
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