Double-Concave Lens
Double-concave lenses have two concave spherical surfaces and a negative focal length. They are mainly used to diverge incident light beams, expand beams, and form virtual images in optical systems, a..
Product Description
Double-concave lenses have two concave spherical surfaces and a negative focal length. They are mainly used to diverge incident light beams, expand beams, and form virtual images in optical systems, and are widely used in projection, imaging and beam expansion applications.
| Project | Performance Parameters | High Precision |
| Material | BK7 or UV fused silica | |
| Specifications | D7.99, D12.7, D25.4, D30, D37 | |
| Dimension Tolerance | ±0.1 mm | ±0.02 mm |
| Focal Length Tolerance | ±1% | ±0.5% |
| Centration | ≤3 arcmin | ≤1.5 arcmin |
| Flatness (within clear aperture) | λ/4 | λ/8 |
| Surface Quality | 20-10 | 10-5 |
| Edge Chip | <0.2 | <0.05 |
| Bevel | 0.1~0.5×45° | |
| Coating | 532 nm, 850 nm, 1064 nm, 1260–1650 nm (customizable) | |