Double-Concave Lens
Specification:
| Material | BK7 or Fused Silica |
| Design Wavelength | 546.1 nm |
| Design Index: | |
| BK7 | 1.5183 ± 0.0005 |
| Fused Silica | 1.46008±0.00005 |
| Diameter Tolerance | +0.00, -0.15 mm |
| Thickness Tolerance | ±0.2 mm |
| Paraxial Focal Length | ±2% |
| Centration | <3 arc minutes |
| Clear Aperture | >85% |
| Surface Irregularity | λ/4@632.8 nm |
| Surface Quality | 60-40 scratch and dig |
| Protective Bevel | 0.25 mm x 45° |
BK7 Double-Concave Lens Standard Products:
|
Part No. |
f (mm) |
Ф (mm) |
R1=R2(mm) |
t c(mm) |
t e(mm) |
f b(mm) |
|
TDE201 |
-10.0 |
10 |
10.70 |
2.0 |
4.5 |
-10.6 |
|
TDE202 |
-20.0 |
12.7 |
21.07 |
2.0 |
4.0 |
-20.6 |
|
TDE203 |
-50.0 |
12.7 |
52.17 |
2.0 |
2.8 |
-50.7 |
|
TDE204 |
-100.0 |
25.4 |
104.0 |
2.0 |
3.6 |
-100.7 |
Note: Other material, size and coating are available upon request.