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Equi-Concave Lenses |
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 Product Information
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The equi-concave lens has a focal length, diverges collimated incident light, and forms only virtual images that are seen through the lens. It is often used to expand light beams or to increase focal length in existing systems, and is normally used in combination with other lenses. |
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Specifications |
Material |
Sapphire, Silicon, Gemanium |
Radius |
R≥3.0 |
Surface Finish |
N＜3,△N≥λ/4 |
Centration |
≥1’ |
Diameter |
≥3.0 ±0.01mm |
T/D |
1/10 |
Surface Quality |
20/10 |
Bevel |
0.25mm at 45 deg |
Coating |
Single or Multi-layer films |
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Specifications |
Material |
Fused Silica, Quartz & optical Glass |
Radius |
R≥1.5 |
Surface Finish |
N＜2,△N≥λ/8 |
Centration |
≥1’ |
Diameter |
≥3.0 ±0.01mm |
T/D |
1/10 |
Surface Quality |
20/10 |
Bevel |
0.25mm at 45 deg |
Coating |
Single or Multi-layer films |
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