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Products  > Lenses  >  Double-Concave lenses (BK7)
 
 
Singlets
 

 

Double-Concave Lenses (N-BK7)
 
Specifications
Material: N-BK7
Diameter tolerance: +/-0.1mm
Design wavelength: 546.1nm
Focal tolerance: +/-2%
surface quality : 60-40 S/D
Centration: 3 arcmin
Surtace flatness: λ/4 @633nm
Clear aperture: 90%
Bevel: Protective bevel
 
 
 
 
ltem#
Material
Φ(mm)
F(mm)
R1(R2)(mm)
Tc(mm)
Te(mm)
Fb(mm)
LB11-12-20
BK7
12.7
-20.0
21.08
2.0
3.96
-20.64
LB11-12-30
BK7
12.7
-30.0
31.48
2.0
3.29
-30.68
LB11-12-40
BK7
12.7
-40.0
41.88
2.0
2.97
-40.70
LB11-12-50
BK7
12.7
-50.0
52.24
2.0
2.78
-50.68
LB11-25-50
BK7
25.4
-50.0
52.17
2.0
5.1
-50.7
LB11-25-75
BK7
25.4
-75.0
78.09
2.0
4.1
-75.7
LB11-25-100
BK7
25.4
-100.0
104.00
2.0
3.6
-100.7
LB11-25-150
BK7
25.4
-150.0
156.0
2.0
3.0
-151.3
LB11-25-200
BK7
25.4
-200.0
207.66
2.0
2.8
-200.7
LB11-25-250
BK7
25.4
-250.0
259.49
2.0
2.6
-250.7
 
Choose Anti-reflective Coatings
 Single layer MgF2
 Multiple layers AR coating
     R<0.25% @ Laser line             (view the curve)
     R<0.5% @ Broadband Wavelength      (view the curve)
 
        How to order Singlet Lenses?              Example:
Material:   N-BK7
Shape:   Double-concave
Diameter:   Φ25.40.1mm
Focal, Radius:   F=+100mm, R1(R2)=104.0mm
Thickness:   Tc=2.00.1mm
Surface quality:   60-40 S/D
Flatness:   λ/4 @633nm
Centration:   3'
Coating:   AR @430--680nm, R<0.5%, AOI=0
 
   Price on Request
 
   Custom Design
 
   Volume Discount 
 
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