Achromatic Waveplates provide a constant phase shift independent of the incident wavelength of light. This wavelength independence is achieved by using two different birefringent crystalline materials. The relative shifts in retardation over the wavelength range are balanced between the two materials used.

General Specifications

Materials                              Quartz + MgF2
Dimension tolerance         ±0.1mm
Parallelism                           1 arcmin
Surface quality                   20-10 S/D
Wavefront distortion         λ/8@632.8nm
Retardation tolerance       λ/100
Clear aperture                    >90%
Coating on both sides       R<0.5% @ design wavelength