The 60Z20ER.2 Broadband Metallic Mirror is an excellent general purpose, broadband reflectors. This 6 inch (152.4 mm) diameter mirror is made from a 23.5 mm thick Zerodur substrate. Zerodur is a glass-ceramic material where thermal expansion is nominally zero. This extra stability can be critical for applications requiring diffraction limited performance. The ER.2 protected silver coating is composed of a low emissivity silver film fully encapsulated by a multilayer dielectric stack to prevent oxidation. This coating has excellent broadband reflectivity in the IR, while maintaining very good performance in the visible and near IR. Average reflectivity is greater than 96% from 480–1100 nm and greater than 98.5% from 1.1–20 µm. This mirror has a λ/10 surface flatness and a 20-10 surface quality.
| Model | 60Z20ER.2 |
|---|---|
| Mirror Shape | Round |
| Wavelength Range | 480 to 20000 nm |
| Diameter | 6.0 in. (152.4 mm) |
| Thickness | 0.93 in. (23.5 mm) |
| Material | Zerodur® |
| Coating Type | Protected Silver |
| Surface Quality | 20-10 scratch-dig |
| Coating Code | ER.2 |
| Clear Aperture | ≥central 80% of diameter |
| Reflectivity | Ravg>96%, Rmin>93% @ 480-1100 nm; Ravg>98.5%, Rmin>97% @ 1.1-20 µm |
| Angle of Incidence | 0-15° |
| Surface Flatness | λ/10 at 632.8 nm over the clear aperture |
| Chamfers | 0.51–1.52 mm face width |
| Chamfers Angle/Tolerance | 45° ±15° |
| Diameter Tolerance | +0/-0.25 mm |
| Thickness Tolerance | ±0.38 mm |
| S2 Surface | Ground |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
