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Double-Concave Lens  

 

Double-concave lens is normally used in combination with other lenses. Typical application include laser beam expanders, optical character readers, viewers, and projection systems.

 

 

 

 

 Applications:

      Beam Expanders
      Projection Optics Systems
      Optical Viewers
      Optical Character Readers

        

  

Capability:

Attribute

Commercial

High Precision

Typical Material

BK7, Fused Silica, B270, Ge, Si, CaF2

Typical Dimension Φ (mm)

2, 4, 6, 12.7, 25.4, 30, 38, 50.8, 95, 160

Diameter Tolerance (mm)

+0.00 / -0.15

+0.00 / -0.02

Paraxial Focal Length

±2%

±0.5%

Centration (arc min)

< 3’

< 1’

Surface Irregularity

λ/4

λ/10

Surface Quality (Scratch / dig)

60-40

10-5

Bevel (face width × 45° mm)

0.2 - 0.5

0.05 - 0.2
Note:
      Other size and coatings are available upon request.
      Any optical materical are available upon request.

 

Item#
Material
f(mm)
F(mm)
R(mm)
Tc(mm)
Te(mm)
Fb(mm)
DCVL1225
BK7
12.7
-25.0
26.30
2.0
3.56
-25.68
DCVL1230
BK7
12.7
-30.0
31.48
2.0
3.29
-30.67
DCVL1240
BK7
12.7
-40.0
41.88
2.0
2.97
-40.70
DCVL1250
BK7
12.7
-50.0
52.24
2.0
2.78
-50.68
DCVL2535
BK7
25.4
-35.0
36.62
2.0
6.5
-35.7
DCVL2550
BK7
25.4
-50.0
52.17
2.0
5.1
-50.7
DCVL2575
BK7
25.4
-75.0
78.09
2.0
4.1
-75.7
DCVL25100
BK7
25.4
-100.0
104.00
2.0
3.6
-100.7
DCVL25200
BK7
25.4
-200.0
207.66
2.0
2.8
-200.7
DCVL25250
BK7
25.4
-250.0
259.49
2.0
2.6
-250.7
DCVL25300
BK7
25.4
-300.0
518.64
2.0
2.5
-300.7
DCVL25500
BK7
25.4
-500.0
259.49
2.0
2.3
-500.7
DCVL251000
BK7
25.4
-1000.0
518.64
2.0
2.2
-1000.7
DCVL38100
BK7
38.0
-100.0
104.17
3.0
6.5
-100.7

   
 

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Tel:+86-(0)591-87846955 +86-(0)591-87846952 Fax: +86-(0)591-87856157 Website:www.phosctech.com E-mail: sales@phosctech.com