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Equi-Concave Lenses
    Publish time 2020-07-28 21:37    
Equi-Concave Lenses
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.

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

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