Achromatic waveplates are similar to zero-order except that the two plates are made from different materials, such as crystal quartz and magnesium fluoride. Since the dispersion of the birefringence can be difference for the two materials, it is possible to specify the retardation value at a wavelength range. Hence, the retardation of the resulting waveplate can be made to low sensitivity to wavelength change.
Based on the contact methods of the two plates, achromatic waveplates are classified into two types: air-spaced and cemented.
Key features:
- Cemented or air spaced
- Broadband wavelength
Specifications
Material: | crystal quartz and MgF2 |
Diameter tolerance: | +0.0, -0.1mm |
Wavefront distortion: | λ/4@632.8mm |
Retardation tolerance: | λ/100 |
Wavelength range: | VIS: 465-610nm, NIR: 700-1000nm, IR: 1200-1650nm |
Parallelism: | < 10 arc second |
Surface quality: | 20-10 scratch & dig |
Coating: | AR/AR, R < 0.2% on both surface at central wavelength |
Achromatic waveplates are similar to zero-order except that the two plates are made from different materials, such as crystal quartz and magnesium fluoride. Since the dispersion of the birefringence can be difference for the two materials, it is possible to specify the retardation value at a wavelength range. Hence, the retardation of the resulting waveplate can be made to low sensitivity to wavelength change.
Based on the contact methods of the two plates, achromatic waveplates are classified into two types: air-spaced and cemented.
Key features:
- Cemented or air spaced
- Broadband wavelength
Specifications
Material: | crystal quartz and MgF2 |
Diameter tolerance: | +0.0, -0.1mm |
Wavefront distortion: | λ/4@632.8mm |
Retardation tolerance: | λ/100 |
Wavelength range: | VIS: 465-610nm, NIR: 700-1000nm, IR: 1200-1650nm |
Parallelism: | < 10 arc second |
Surface quality: | 20-10 scratch & dig |
Coating: | AR/AR, R < 0.2% on both surface at central wavelength |
