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Concave lenses, are a simple lens with one spherical face and one flat plano face. Because the spherical face is concave the lens has a negative focal length, allowing the part to increase the divergence of convergent light. Concave lenses can be used to balance out the spherical aberrations caused by other lenses. This makes concave lenses very useful for controlling laser beams.

Being a simple lens, concave lenses have a broad range of applications including, but not limited to, focussing and control of laser beams, moderate quality imaging and other optical instruments. In a multi-element optical system they reduce the power of the system. Used on their own they form a diverging cone or virtual image. A typical use for concave lenses would be in a beam expander.

Knight Optical stock a range of concave lenses from commercial grade to high quality N-BK7 or equivalent type. Our stock range of concave lens sets are helpfull for design and laboratory use. All lenses can be edged down to smaller sizes at short notice.

Every component is individually tested by our highly skilled technicians in our state of the art metrology lab to ensure all components meet our high quality standards. Contact our multilingual technical sales team and discover how Knight Optical’s high quality concave lenses can improve your instrumentation and supply chain experience.

Centration Accuracy:
Focal Length (@587nm):
Centre Thickness:
Surface Quality:
N-BK7 or equivalent, SF11 or equivalent (for lower spherical aberrations)
+0.0 / -0.10mm
< 5 arcmin
± 0.2mm (≤10mm) ± 2.0% (>10mm)
± 0.15mm
<40-20 scratch/dig

Planoconcave lenses with suffix "AV2" are coated on both faces with:
multilayer antireflective coating <0.5%@450-900nm

Mounting into lens cells.
Special AR coating to meet visible and NIR telecoms applications.
Stock lenses can be edged to smaller diameters.

Planoconcave lenses with suffix "AV2" are coated on both faces with:
multilayer antireflective coating <0.5%@450-900nm

9 Items

Name Coating Focal Length (mm) Diameter (mm) Material Price Buy
LNQ1006 Uncoated 10.0 6.0 BK7 or equivalent
LNQ1512 Uncoated 15.0 12.5 BK7 or equivalent
LNQ2010 Uncoated 20.0 10.0 BK7 or equivalent
LNQ5012 Uncoated 50.0 12.5 BK7 or equivalent
LNQ10025 Uncoated 100.0 25.0 N-BK7 or equivalent
LNQ12525 Uncoated 125.0 25.0 N-BK7 or equivalent
LNQ20025 Uncoated 200.0 25.0 N-BK7 or equivalent
LNQ50025 Uncoated 500.0 25.0 N-BK7 or equivalent
LNQ100025 Uncoated 1000.0 25.0 N-BK7 or equivalent

9 Items


Planoconcave Lenses

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