Achromatic waveplate is similar to zero order waveplate except that the two plates are made from different birefringent crystals. Since the dispersion of the birefringence of two materials is different, it is possible to specify the retardation values at a broad wavelength range. So, the retardation will be less sensitive to wavelength change.
| Parameter | Standard Specification |
| Material | Crystal Quartz+MgF2 |
| Surface quality | 40-20 |
| Wavefront Distortion | λ/4@632.8nm (for air spaced type) |
| Clear Aperture | >90% |
| Parallelism | <10 arc seconds (for single plate) |
| Retardation Tolerance | <λ/100 |
| Standard Wave | quarter-wave(λ/4), half-wave(λ/2) |
| Standard wavelength | 450-650nm 550-750nm 650-1100nm 900-2100nm |
| Coating | Both surfaces AR coated, R<1% per surface |
| Damage Threshold | Cemented: >500mJ/cm2, 20ns, 20Hz@1064nm Air spaced: >5J/cm2, 20ns, 20Hz@1064nm |
| * Remark：Customized is available | |
