Bi-concave spherical lenses
Main features
- Fabricated from high-quality UV grade fused silica, BK7 glasses
- Standard diameter is ⌀25,4 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
- Standard specifications
Bi-concave spherical lenses feature two spherical concave surfaces with 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 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/-0,1 mm |
| Thickness tolerance | ±0,5 mm |
| Centration erorr | <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/[email protected],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
70 €
UVFS
⌀25,4 mm
2 mm
-75 mm
7574
70 €
UVFS
⌀25,4 mm
2 mm
-100 mm
7575
70 €
BK7
⌀25,4 mm
2 mm
-25 mm
7576
20 €
BK7
⌀25,4 mm
2 mm
-50 mm
7577
20 €
BK7
⌀25,4 mm
2 mm
-75 mm
7578
20 €
BK7
⌀25,4 mm
2 mm
-100 mm
7579
20 €
UVFS
⌀25,4 mm
2 mm
-25 mm
7580
70 €
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