These mirrors consist of a high effiency 1/4 wave phase reflectance thin-film coating applied to a highly polished mirror substrate. This specialized coating design changes a linearly polarized CO2 laser beam to a circularly polarized one.
Specifications: Phase Retarder Reflectors
- Diameter Tolerance: + 0.000"/-0.005"
- Thickness Tolerance: ±0.010"
- Mechanical Wedge: < 5 minutes of arc
- Flatness: Cu PRR: <1/20th wave at 10.6 micron, Si PRR: < 1/40th wave at 10.6 micron
- Finish (Scratch-Dig): Cu PRR: 40-20, Si PRR: 40-20
MATERIAL | PHASE SHIFT BETWEEN P & S POLARIZATION | REFLECTANCE@10.6 MICRONS AND 45 DEG. AOI | ABSORPTION & SCATTER |
Silicon (Si) | 90 deg. ±3 deg. | >98.5% Avg. | < 1.5% |
Copper (Cu) | 90 deg. ±5 deg. | >98.5% Avg. | < 1.5% |
PRR-90-50-Cu | Copper | 50.00mm | 10.00mm | 90º Phase Shift |
PRR-90-50-Si | Silicon | 50.00mm | 10.00mm | 90º Phase Shift |
PRR-90-38-Si | Silicon | 38.00mm | 4.00mm | 90º Phase Shift |
PRR-90-25-Si | Silicon | 25.00mm | 3.00mm | 90º Phase Shift |