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Double concave lens
Double-Concave Lens, also named Bi-Concave Lens, is used to divergent light. It is best used when the input beam is converging.
Capacity:
Material: Optical glass, Fused silica, Silicon, Germanium, CaF2, MgF2, Sapphire, ZnSe, ZnS
Diameter: 0.5 to 350 mm
Diameter Tolerance: +0/-0.02 mm
Thickness Tolerance: ±0.01 mm
Surface Quality: 10-5
Surface Figure: λ/10
Centration: 1 minute or 30 Second
Coating: Uncoated, AR and HR
Double concave lens.jpg

 

Specification:

Material

BK7 or Fused Silica

Design Wavelength

546.1 nm

Design Index:

 

              BK7

1.5183 ± 0.0005

              Fused Silica

1.46008±0.00005

Diameter Tolerance

+0.00, -0.15 mm

Thickness Tolerance

±0.2 mm

Paraxial Focal Length

±2%

Centration

<3 arc minutes

Clear Aperture

>85%

Surface Irregularity

λ/4@632.8 nm

Surface Quality

60-40 scratch and dig

Protective Bevel

0.25 mm x 45°

 

 

BK7 Double-Concave Lens Standard Products:

Part No.

f (mm)

Ф (mm)

R1=R2(mm)

t c(mm)

t e(mm)

f b(mm)

 TDE201

-10.0

10

10.70

2.0

4.5

-10.6

 TDE202

-20.0

12.7

21.07

2.0

4.0

-20.6

 TDE203

-50.0

12.7

52.17

2.0

2.8

-50.7

 TDE204

-100.0

25.4

104.0

2.0

3.6

-100.7

Note: Other material, size and coating are available upon request.

 

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