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An Achromatic Waveplate, AWP, is similar to a Zero-Order waveplate which is made from two pieces of Crystal Quartz except that the AWP is composed of one piece of Crystal Quartz and one piece of Magnesium Fluoride, MgF2. Both of these materials are birefringent, however, by proper matching of the birefringent changes in one material with those of the second, retardation changes are minimized as the wavelength changes. This phenomenon produces a waveplate whose change in retardation is extremely small for large variations in wavelength. For tunable sources or Lasers with large spectral widths, you'll want an AWP, one whose performance is nearly independent of wavelength.

Tower Optical's AWP's are designed to effectively eliminate the wavelength dependence over a wide spectral range, typically several hundred nanometers. The AWP's are available for three wavelength ranges: VIS (465-610nm), NIR (700-1000nm) and IR (1200-1650nm). These AWP's operate beyond these ranges however; the retardation change exceeds the specification. The standard versions are airspaced. Custom assemblies, including cemented versions, are available to meet your specific requirements. Send us your drawing for a quote on a custom AWP. Visit us at www.TowerOptical.com