Request InfoTower Optical Corp.Tower Optical Corp. has released a line of achromatic wave plates that cover the 465- to 610-nm, 700- to 1000-nm and 1200- to 1650-nm wavelengths, ranging from the visible to the IR. They have a clear aperture of 11.5 mm and are available, in all ranges, for both λ/4- and λ/2 retardation. Air-spaced versions are standard, and a cemented version is available by special order. 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