Bi-concave spherical lenses
Main features
- Standard lenses are made from laser grade UVFS or BK7 glass material, other materials are also available
- Lenses are available in standard ⌀25,4 mm diameter or custom
- Anti-reflective coatings on demand
Application examples
- Beam expanders
- Optical projection systems
Request custom
- Description
- Specifications
Bi-concave spherical lenses are optical elements in which both surfaces are concave and have the same radius of curvature. These lenses are similar to plano-concave lenses due to negative focal length and ability to diverge collimated light. The best performance of bi-concave lenses is achieved when used as close as possible to 1:1 conjugate ratio. 4Lasers offer various focal length plano-convex spherical lenses made from borosilicate crown glass BK7 and UV grade fused silica. In order to achieve optimized transmission ratio anti-reflection coatings are generally applied on to the lens input and exit surfaces.
| Bi-concave spherical lenses | |
|---|---|
| Design wavelength | 546,1 nm |
| Focal length tolerance | ±3% |
| Clear aperture | >90% |
| Diameter tolerance | +0/-0,1 mm |
| Thickness tolerance | ±0,5 mm |
| Centration erorr | <3 arcmin |
| Protective chamfers | <0,35 mm at 45° |
| Coatings | Uncoated, available |
| Surface quality | 40-20 S-D |
| Surface irregularity | <λ/[email protected],8 nm |
Order your item
Material
Diameter
Center thickness
Edge thickness
Focal length
ROC
SKU
price
quantity
UVFS
⌀25,4 mm
2 mm
5,6 mm
-50 mm
46,32 mm
7573
Request
UVFS
⌀25,4 mm
2 mm
4,3 mm
-75 mm
69,33 mm
7574
Request
UVFS
⌀25,4 mm
2 mm
3,8 mm
-100 mm
92,33 mm
7575
Request
BK7
⌀25,4 mm
2 mm
6,5 mm
-35 mm
36,62 mm
7576
Request
BK7
⌀25,4 mm
2 mm
5,1 mm
-50 mm
52,17 mm
7577
Request
BK7
⌀25,4 mm
2 mm
4,1 mm
-75 mm
78,09 mm
7578
Request
BK7
⌀25,4 mm
2 mm
3,6 mm
-100 mm
104 mm
7579
Request
UVFS
⌀25,4 mm
2 mm
7,2 mm
-35 mm
32,52 mm
7580
Request
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