Achromatic Waveplate
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. In other words, it can be used at a broadband wavelength range.
- Epoxy Cemented or Air Spaced available
- Very Broad Bandwidth
- Custom size available
Specifications
| Material | Crystal Quartz + MgF2 |
| Dimension Tolerance | + 0.0/ -0.2 mm |
| Surface Quality | 40/20 |
| Clear Aperture | > 90% central area |
| Wavefront Distortion | < λ/4@632.8 nm (for air spaced type) |
| Parallelism | < 10 arc seconds (for single plate) |
| Retardation Tolerance | < λ/100 |
| Standard Wave | quarter-wave(λ/4), half-wave(λ/2) |
| Standard Wavelength | 450-650 nm, 550-750 nm, 650-1100 nm, 900-2100 nm |
| Coating | Both sides AR coated, R < 1% per face |
| Damage Threshold | Cemented: > 500 mJ/cm2, 20 ns, 20 Hz@1064 nm Air spaced: > 5 J/cm2, 20 ns, 20 Hz@1064 nm |
Model
| Dia., mm | Wavelengths, nm | Retardation | CA, mm | Type | Mount*, mm |
| 10 | 450-650, 550-750, 650-1100, 900-2100 | λ/2, λ/4 | 8 | Cemented | φ25.4 x 6 |
| 15 | 450-650, 550-750, 650-1100 | λ/2, λ/4 | 13.5 | ||
| 15 | 900-2100 | λ/2 | 13.5 | ||
| 20 | 780 & 1550 | λ/2 | 18 | ||
| 20 | 450-650, 550-750, 650-1100, 900-2100 | λ/2, λ/4 | 18 | Air spaced | |
| 20 | 400-650 | λ/2 | 18 | ||
| 25.4 | 450-650 | λ/4 | 22.9 | φ 30 x 6 |
* Unmounted Version upon request.