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             Achromatic waveplate is similar to Zero-order waveplate except that the two plates are made from different materials, such as crystal quartz and magnesium fluoride. Since the dispersion of the birefringence can be different for the two materials, it is possible to specify the retardation values at a wavelength range.

            Optical grade Crystal Quartz and MgF2
            Dimension Tolerance:
            +0.0, -0.2mm
            Wavefront Distortion:
            < l/ 8@633nm
            Retardation Tolerance:
            <l/ 100
            Surface Quality:
            20/10 Scratch and Dig
            AR Coating:
            R<0.2% at center wavelength
            Standard wavelength:
            VIS :465-610nm,

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