Double Concave Lenses
Double Concave Lenses are manufactured with two concave surfaces on both sides of the lens. This kind of lenses have a negative focal length and are best used to diverge a converging beam.
| Specifications | |||
|---|---|---|---|
| Material | BK7 |  |
|
| Dimension Tolerance | +0.0, -0.05mm | ||
| Clear Aperture | >85% | ||
| Flatness | λ/4@632.8nm | ||
| Surface Quality | 60-40 | ||
| Centration | 3 arc min | ||
| Design Wavelength | 546.1nm | ||
| Design Index | 1.5183+/-0.0005 | ||
| Paraxial Focal Length Tolerance | +/-2% | ||
| Bevel | 0.25mm x 45° | ||
| Coating | Uncoated | ||
| Part No | Φ(mm) | f (mm) | R1=R2 (mm) | tc (mm) | te (mm) | fb (mm) |
|---|---|---|---|---|---|---|
| DCV1201 | 12.7 | -25.0 | 26.25 | 2.0 | 3.6 | -25.7 |
| DCV1202 | 12.7 | -30.0 | 31.44 | 2.0 | 3.3 | -30.7 |
| DCV1203 | 12.7 | -40.0 | 41.80 | 2.0 | 3.0 | -40.7 |
| DCV1204 | 12.7 | -50.0 | 52.17 | 2.0 | 2.8 | -50.7 |
| DCV1301 | 25.0 | -25.0 | 26.25 | 2.0 | 8.6 | -25.7 |
| DCV1302 | 25.4 | -35.0 | 36.62 | 2.0 | 6.5 | -35.7 |
| DCV1303 | 25.4 | -50.0 | 52.17 | 2.0 | 5.1 | -50.7 |
| DCV1305 | 25.4 | -75.0 | 78.09 | 2.0 | 4.1 | -75.7 |
| DCV1306 | 25.4 | -100.0 | 104.00 | 2.0 | 3.6 | -100.7 |
Note: Other sizes, material and coatings are available upon request.
