An achromatic waveplate is a high-performance retarder whose core design goal is to maintain an almost constant phase retardation across a broad wavelength range. It overcomes a major limitation of common zero-order and multi-order waveplates—their strong wavelength dependence. It is typically constructed by cementing two different birefringent materials together. These two materials possess different dispersion characteristics.
Ultra-broad bandwidth and exceptional performance stability.
High accuracy.
High cost and sensitivity to the angle of incidence.
| Material | Crystalline Quartz and MgF2 |
| Parallelism | ＜10 arcsec |
| Diameter Tolerance | +0.0,-0.1mm |
| Transmitted Wavefront Error | λ/8@633nm |
| Surface Quality | 40-20 |
