Concave Mirror Substrates
These spherical concave substrates are used to make spherical concave mirrors for laser beam concentration and quality imaging. All spherical concave mirror substrates have a focal length equal to half their radius of curvature. The front concave spherical section is polished to ½ λ. on a BK7 substrate. The spherical concave mirrors are offered as a catalog product with aluminum coating. Other reflective coatings are available; please see High Reflective Coatings for other thin film coatings that meet your requirements.
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| Radius of Curvature, r (mm) | Diameter, D (mm) | Edge, te (mm) | Center, tc (mm) | Material | Surface Flatness | Surface Quality | Diameter tolerance | Thickness tolerance | Radius tolerance | Clear Aperture |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 15.0 | 7.0 | 3.6 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 20 | 15.0 | 5.0 | 3.5 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 30 | 15.0 | 5.0 | 4.0 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 40 | 15.0 | 5.0 | 4.3 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 50 | 15.0 | 5.0 | 4.4 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 100 | 15.0 | 5.0 | 4.7 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 250 | 15.0 | 5.0 | 4.9 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 500 | 15.0 | 5.0 | 4.9 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 1000 | 15.0 | 5.0 | 5.0 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |
| 2000 | 15.0 | 5.0 | 5.0 | BK7 | λ/2 | 20-10 | +0, -0.1mm | ±0.2mm | ±2% | 80% |