Dual wavelength waveplate is a low or multi-order waveplate, but which is suitable for two different wavelengths with different retardation. The dual wavelength waveplate is often applied in laser harmonic generation.
| ATTRIBUTE | SPECIFICATIONS |
| material | Crystal Quartz |
| DIAMETER TOLERANCE | +0.0, -0.1mm |
| wavefront distortion | λ/8 |
| retardation tolerance | λ/500 |
| wavelength range | 240-1200nm |
| parallelism | < 1 arc second |
| SURFACE FIGURE: IRREGULARITY(N) | <0.5 fringe |
| SURFACE QUALITY | 20/10 scratch and dig |
| COATING | With AR coating on outside surfaces |
