CRYLINK achromatic half wave plate is composed of quartz wave plate and MgF₂ wave plate. The fast axes of the two wave plates are perpendicular to each other. When a beam of linearly polarized light is vertically incident on a wave plate, it is decomposed into o-ray and e-ray propagating along the original direction but perpendicular to each other, and the corresponding refractive index is n_o,n_e . Due to the different velocities of the two kinds of light in the crystal, the phase delay is δ=(2π/λ)|no -ne |*d after passing through the wave plate with thickness D. Among them, |n_o -n_e |*d is the optical path difference, the optical path difference generated by a half wave plate is (2m+1)*λ/2, the phase delay is δ=(2m+1)*π, and m is a non negative integer. The phase delay of achromatic half wave plate is the result of quartz wave plate and MgF₂ wave plate. By designing the thickness of the two wave plates, the phase delay of achromatic half wave plate is π, and the fast axis direction is determined by the wave plate with large phase delay. CRYLINK achromatic half wave plate is usually used to rotate the polarization direction of linearly polarized light. Compared with other half wave plates of CRYLINK, achromatic half wave plate is insensitive to wavelength, and the design wavelength range is 400 nm-700 nm, 700 nm-1100 nm and 1100 nm-1650 nm.

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