Request InfoThorlabs Inc.Thorlabs Inc.'s achromatic wave plates are zero-order retarders that use two birefringent materials, crystalline quartz and magnesium fluoride, to balance dispersion and to provide a nominally flat spectral response. Each wave plate is computer-designed and optimized for minimum root mean square retardance error over a broad spectral range. They are air-spaced, have antireflection coatings on all surfaces for low insertion loss, and can handle high optical powers. Quarter and half versions are available. 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