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Senior sales engineer
Arminas Butkus +370 5 219 4884
Bi-concave spherical lenses
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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 View stock
  • 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 €