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Sales engineer
Arminas Butkus +370 5 219 4884
Bi-concave spherical lenses
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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