The 30Z40AL.2 Broadband Metallic Mirror is an excellent general purpose, broadband reflectors. This 3 inch (76.2 mm) diameter mirror is made from a 14.7 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 AL.2 UV enhanced aluminum coating is a durable, broadband UV reflector with average reflectivity greater than 90% from 250–600 nm. The aluminum film is overcoated with UV transparent magnesium fluoride to prevent oxidation of the metal. This mirror has a λ/20 surface flatness and a 10-2 surface quality.
| Model | 30Z40AL.2 |
|---|---|
| Mirror Shape | Round |
| Wavelength Range | 250 to 600 nm |
| Diameter | 3.0 in. (76.2 mm) |
| Thickness | 0.58 in. (14.7 mm) |
| Material | Zerodur® |
| Coating Type | UV Enhanced Aluminum |
| Surface Quality | 10-2 scratch-dig |
| Coating Code | AL.2 |
| Clear Aperture | ≥central 80% of diameter |
| Reflectivity | Ravg>90% @ 250-600 nm |
| Angle of Incidence | 0-15° |
| Surface Flatness | λ/10 at 632.8 nm over the clear aperture |
| Chamfers | 0.38–1.14 mm face width |
| Chamfers Angle/Tolerance | 45° ±15° |
| Diameter Tolerance | +0/-0.13 mm |
| Thickness Tolerance | ±0.25 mm |
| S2 Surface | Ground |
| Damage Threshold | 0.3 J/cm² with 10 ns pulses at 355 nm, 20Hz |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
