| Material | Single crystal quartz |
| Optical axis | normal to facet on circumference of retarder |
| Wavefront distortion | λ/10@633 nm |
| Surface quality | 20-10 scratch & dig (MIL-PRF-13830B) |
| Parallelism | <10 arcsec |
| AR coating | R<0.5% |
| Laser damage threshold | 100 mJ/cm2, 50 fsec pulse, 800nm typical |
| EKSMA Optics Femtoline Zero Order Air-Spaced Waveplates
77.24 kB |