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The 60Z40ER.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/20 surface flatness and a 10-5 surface quality.
feature | |
Angle of Incidence | 0-45° |
Chamfers | 0.51–1.52 mm face width |
Chamfers Angle Tolerance | 45° ±15° |
Cleaning | See How to Clean Optics |
Clear Aperture | ≥central 80% of diameter |
Coating Code | ER.2 |
Coating Type | Protected Silver |
Damage Threshold | 1 J/cm² with 10 ns pulses at 1064 nm, 20Hz |
Diameter | 152.4 mm |
Diameter Tolerance | +0/-0.25 mm |
Material | Zerodur® |
Mirror Shape | Round |
Mirror Size | Ø152.4 mm |
Reflectivity | Ravg>96%, Rmin>93% @ 480-1100 nm;Ravg>98.5%, Rmin>97% @ 1.1-20 µm |
S2 Surface | Ground |
Substrate Number | 60Z40 |
Surface Flatness | λ/20 at 632.8 nm |
Surface Quality | 10-5 scratch-dig |
Thickness | 23.5 mm |
Thickness Tolerance | ±0.38 mm |
Wavelength Range | 480-20000 nm |
Wavelength Region | Broadband |