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Double-Concave lenses are most suited to produce diverging light or a virtual
image where the input light is converging.
BK7 Double-Concave Lenses
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Main Specifications
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|
Material |
BK7 grade A optical glass |
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Design Wavelength |
546.1nm |
|
Design Index |
1.5183 ± 0.00005 |
|
Diameter Tolerance |
-0.0, -0.15mm |
| Paraxial
Focal Length |
± 2% |
| Centration |
< 3 arc
minutes |
| Clear
Aperture |
>85% |
| Surface
Figure |
l/4@632.8nm |
| Surface Quality |
60-40 scratch and dig |
| Bevel |
0.25 mm x 45° |
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Fused Silica Double-Concave Lenses
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Main Specifications
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Material |
UV graded Fused Silica |
|
Design Wavelength |
546.1nm |
|
Design Index |
1.46008 ± 0.00005 |
|
Diameter Tolerance |
-0.0, -0.15mm |
| Paraxial
Focal Length |
± 2% |
| Centration |
<3 arc
minutes |
| Clear
Aperture |
>85% |
| Surface
Figure |
l/4@632.8nm |
| Surface Quality |
60-40 scratch and dig |
| Bevel |
0.25 mm x 45° |
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