| Specification | Details |
|---|
| Diameter | 25 mm to 300 mm |
| Thickness | As per diameter-to-thickness ratio standards |
| Flatness | λ/20 to λ/4 (@ 632.8 nm) |
| Material | Optical Grade BK7 / Fused Silica |
| Surface Quality | 60/40 Scratch-Dig (better on request) |
| Parallelism | < 30 arc seconds |
| Clear Aperture | > 90% of diameter |
| Coating | Uncoated / AR Coated / Reflective on request |
| Chamfer | 0.3 – 0.5 mm x 45° |
| Application | Interferometric testing, calibration, alignment reference |
Subject to technical changes
