Double-Concave Lenses
 | Features
 | Lower spherical aberrations than for Plano-Concave lenses |
| Various AR coatings are available for all these lenses. Please refer to the Coatings section |
| Other dimensions are available in small and mass production quantities |
|
Description
Double concave lenses are symmetrical with equal radius on both sides.
The biconcave lenses are often used to expand light beams or to increase focal lengths in optical systems, and are normally used in combination with other lenses. Among the many devices utilizing biconcave lenses there are laser beam expanders, optical character readers, viewers and projection systems.
Under customers request lens are anti-reflection coated (please refer to the Coatings section).
|
Standard Specifications
| Surface Quality |
40-20 scratch & dig |
| Design wavelength |
632.8 nm |
| AR coatings |
None. |
| Surface Figure |
λ/4@632.8nm |
| Clear Aperture |
>90% |
| Centration |
on <3 arc minutes |
| Focal Length |
±3% |
| Diameter Tolerance |
+0.0, -0.15mm |
|
Properties (Diameter D, Focal length L)
| D, mm |
D, Inches |
L Minimal, mm |
L Maximal, mm |
| 12,7 |
0.5 |
-12 |
-10.000 |
| 25,4 |
1 |
-25 |
-10.000 |
| 38,1 |
1,5 |
-40 |
-10.000 |
| 50,8 |
2 |
-50 |
-10.000 |
| 76,2 |
3 |
-75 |
-10.000 |
|
Catalog Items
| Material |
Diameter, mm |
Focal Length, mm |
Edge Thickness, mm |
Product ID |
Price, |
| BK7 |
12.7 |
-12 |
5.0 |
1-BCV-1-A127 |
32 |
| BK7 |
12.7 |
-15 |
5.0 |
1-BCV-1-B127 |
30 |
| BK7 |
12.7 |
-20 |
4.5 |
1-BCV-1-C127 |
28 |
| BK7 |
25.4 |
-25 |
8.0 |
1-BCV-1-A254 |
38 |
| BK7 |
25.4 |
-30 |
8.0 |
1-BCV-1-B254 |
34 |
| BK7 |
25.4 |
-35 |
7.0 |
1-BCV-1-C254 |
32 |
| BK7 |
25.4 |
-50 |
7.0 |
1-BCV-1-D254 |
30 |
| |
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