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The morphology of ca. equimolar random terpolymer liquid crystal polymers of an aliphatic segment of 4–7 carbon atoms, oxybenzoate, and dioxyphenyl crystallized from the nematic state in the form of thin films on glycerine by slow cooling and quenching has been characterized by electron microscopy (TEM) and diffraction (ED). In all cases a folded chain, lamellar structure is found. The ED studies suggest adjacent reentry, and despite a large ΔH, indicate no change in lateral molecular packing at the crystal‐“liquid crystal” transition with a transformation to the nematic state at a higher temperature “liquid crystal”‐liquid crystal transition. The results are interpreted as suggesting similar folded chain, lamellar morphology in the nematic state. © 1992 John Wiley & Sons, Inc.

Polarized catadioptrics (i.e., folded optics, pancake lenses) offer increased resolution and reduced aberrations across a wider field‐of‐view, and in a smaller physical package than conventional refractive optics for virtual reality (VR) head‐mounted display applications. One of the major challenges with polarized catadioptrics is achieving a high contrast ratio. In this paper we will review data generated experimentally and through simulations that demonstrate the impact of key system attributes on contrast ratio. The parameters we explore include the quarter‐wave plate material selection, scattering in the optical components, and rotational alignment between the polarization sensitive components.

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