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Polarizers & Optical Filters. Browse API's selection of linear and circular polarizers, optical filters and display enhancement solutions for a broad range of markets. We offer polarizers for the visible light, near IR and UV spectrum. Learn More API offers a wide selection of in-stock linear polarizer films available in large panels and sheet sizes. In addition, any of the products below can be custom cut, silk screened or laminated to acrylic or glass. A linear polarizing filter followed by a quarter-wave plate whose slow and fast axes are at 45° to the axis of the polarizer becomes a circular polarizing filter, and incident unpolarized light emerges as circularly polarized light. This will not work if the order of the polarizer and wave plate is reversed. 3D Circular Polarizer Pair of Sheets - Left and Right Eye High Contrast Circular Polarizing Plastic Film. This is the raw material from which they make RealD Passive 3D glasses. PC Series: Circular Polarizing Film. PC Series Circular Polarizing Film consists of a linear polarizer combined with a quarter wave retarder, left or right, to rotate the plane of the polarization 90°. As light passes through circular polarizing film it is converted to circularly polarized light. Compatible MidOpt Polarizing Filter: A homogeneous circular polarizer passes one handedness of circular polarization unaltered and blocks the other handedness. This is similar to the way that a linear polarizer would fully pass one angle of linearly polarized light unaltered, but would fully block any linearly polarized light that was orthogonal to it.