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Details |
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Double concave lenses
Double-Concave Lens, also named Bi-Concave Lens, is used to divergent light. It is best used when the input beam is converging.
Application:
Beam Expander
Projection Optics System
Imaging Optics System
Optical Viewer
Optical Character Reader
Specification:
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Material |
BK7 or Fused Silica |
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Design Wavelength |
546.1 nm |
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Design Index: |
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BK7 |
1.5183 ± 0.0005 |
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Fused Silica |
1.46008±0.00005 |
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Diameter Tolerance |
+0.00, -0.15 mm |
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Thickness Tolerance |
±0.2 mm |
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Paraxial Focal Length |
±2% |
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Centration |
<3 arc minutes |
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Clear Aperture |
>85% |
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Surface Irregularity |
λ/4@632.8 nm |
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Surface Quality |
60-40 scratch and dig |
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Protective Bevel |
0.25 mm x 45° |
BK7 Double-Concave Lens Standard Products:
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Part No. |
f (mm) |
Ф (mm) |
R1=R2(mm) |
t c(mm) |
t e(mm) |
f b(mm) |
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DIT211 |
-10.0 |
10 |
10.70 |
2.0 |
4.5 |
-10.6 |
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DIT212 |
-20.0 |
12.7 |
21.07 |
2.0 |
4.0 |
-20.6 |
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DIT213 |
-50.0 |
12.7 |
52.17 |
2.0 |
2.8 |
-50.7 |
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DIT214 |
-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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