Bi-Concave Lenses
Bi-Concave Lenses Light Path

Bi-Concave Lenses

Material:
N-BK7, UV grade fused silica, CaF₂ etc

Surface Flatness:
N<3, △N<λ/4

Coating:
Uncoated,
Single Layer MgF
,
AR/AR@250-400nm, Ravg<0.5%,
AR/AR@400-700nm, Ravg<0.5%,
AR/AR@650-1050nm, Ravg<0.5%,
AR/AR@1000-1650nm, Ravg<0.5%

Surface Quality:
60/40~10/5

Clear Aperture:
>90%

wdt_ID Attributes Value
1 Material N-BK7
UV grade fused silica
CaF₂ etc
17 Diameter Tolerance +0.0,-0.1mm
18 Center Thickness +/-0.2mm
19 Surface Quality 60/40~10/5
20 Paraxial Focal Length +/-1% (EFL<1m)
+/-2%(EFL>1m)
21 Surface Flatness N<3, △N<λ/4
25 Clear Aperture >90%
26 Coating Uncoated,
Single Layer MgF₂
AR/AR@250-400nm, Ravg<0.5%
AR/AR@400-700nm, Ravg<0.5%
AR/AR@650-1050nm, Ravg<0.5%
AR/AR@1000-1650nm, Ravg<0.5%

Bi-concave lenses have a negative focal length and are best used to diverge a converging beam. Bi-concave lenses can diverge a collimated beam to a virtual focus and are commonly used in Galilean-type beam expanders.

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