Bi-concave spherical lenses
Main features
- Fabricated from high-quality UV grade fused silica, BK7 glasses
- Standard diameter is ø25,4 mm
- Focal length selection from -25 mm to -100 mm
- Antireflective coating, custom substrate material, dimensions, and focal lengths available upon request
Application examples
- Beam expanders
- Relay imaging
Request custom
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- Description
- Drawing
- Standard specifications
Bi-concave spherical lenses feature two spherical concave surfaces with the same radius of curvature, while their focal length is negative. The performance of these lenses is best when used for finite conjugate (0,2X - 5X ratio) applications, most often to diverge converging light.
| Bi-concave spherical lenses | |
|---|---|
| Substrate material | BK7, UVFS |
| Wavelength range | Uncoated BK7 lenses: 350 nm - 2 μm Uncoated UVFS lenses: 185 nm - 2,1 μm |
| Clear aperture | >90% |
| Diameter tolerance | +0,0/-0,1 mm |
| Center thickness | 2 mm |
| Thickness tolerance | ±0,5 mm |
| Centration error | <3 arcmin |
| Focal length tolerance | ±3%@632,8 nm |
| Protective chamfers | <0,35 mm at 45° |
| Surface quality | 40-20 S-D |
| Surface irregularity | <λ/4@632,8 nm |
| Coatings | Uncoated, available upon request |
Order your item
Material
Diameter
Center thickness
Focal length
SKU
PRICE
QUANTITY
UVFS
⌀25,4 mm
2 mm
-50 mm
7573
72 €
UVFS
⌀25,4 mm
2 mm
-75 mm
7574
72 €
UVFS
⌀25,4 mm
2 mm
-100 mm
7575
72 €
BK7
⌀25,4 mm
2 mm
-25 mm
7576
28 €
BK7
⌀25,4 mm
2 mm
-50 mm
7577
28 €
BK7
⌀25,4 mm
2 mm
-75 mm
7578
28 €
BK7
⌀25,4 mm
2 mm
-100 mm
7579
28 €
UVFS
⌀25,4 mm
2 mm
-25 mm
7580
72 €
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