Optical Lens
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Plano Concave Lens
PARAMETER:
Plano concave lens bend parallel input rays so they diverge from one another on the output side of the lens and hence have a negative focal length. The spherical aberration of the plano concave lenses is negative and can be used to balance aberrations created by other lenses. Similar to the plano concave lens, the curvature surface usually faces the largest object distance or the infinite conjugate to minimize spherical aberration.
Specification
Material Optical glass/ Fused silica/ sapphire etc. Diameter 2mm~300mm Diameter tolerance ±0.05mm(≤50mm) ±0.1mm(＞50mm) Focal length -50mm~-2000mm Focal length tolerance ±0.2%（＜10mm） ±0.5%（＜10mm-1000mm） ±1%（＜＞1000mm） Edge Thickness 2mm~20mm Surface quality 60/40， 40/20， 20/10 Surface accuracy λ/2~λ/10@632.8nm，532nm, etc. Clear Aperture >85% dig diameter Centration <3arc min~ 30arc sec Chamfer <0.2mm×45° Coating As per customer’s request
