UV-fused silica concave lenses Planoconcave lenses have one inward curved face and one flat face. Planoconcave lens bend parallel input rays so that they diverge away from one another on the output side of the lens. They have a negative focal length.  Planoconvex lenses are mainly used for image reduction or to spread light. Planoconcave lenses are also known as a tube-length correction lens in microscopy and as a Barlow lens in astronomy. These Planoconcave lenses made from fused silica for use in the UV down to 170nm. Ideal for hostile environments requiring greater thermal, chemical and radiation resistance compared to ordinary glasses. Fused silica concave lenses are stocked uncoated or with a multilayer AR coating for 248-400nm.
Knight Optical > Lenses > Concave lenses - UV Fused Silica Uncoated This is the section containing Uncoated. AR coated 245-400nm This is the section containing AR coated 245-400nm. Only UK and EU customers are charged VAT at 17.5%, customers outside the EU and EU customers based outside the UK who have a valid EU VAT number will not be charged VAT Bulk Discounts! Where (B) appears next to a price below, bulk prices are available, click the (B) button to view! Knight Optical > Lenses > Concave lenses - UV Fused Silica
Specification   Form: Planoconcave  Material: UV fused silica Material Data: (see materials section)  Diameter: +0.0 / -0.10mm  Centring Accuracy: < 0.1mm (F.L 40mm) < 2.5mrad (F.L > 40mm)  Focal Length (@587nm): ± 2mm  Centre Thickness: ± 0.15mm  Surface Quality: <40-20 scratch/dig (see quality section)
Specific requirements We can manufacture UV Fused Silica Concave Lenses to any size or focal length at short notice, so if your requirements are not listed please contact us by telephone/ fax or email: stockrequirement@knightoptical.co.uk Coating UV fused silica concave Lenses with suffix “AV1” are coated on both faces with (multilayer antireflective coating <0.5%@248-400nm) (see coatings section) Options available   · Mounting (all items)   · Special AR coating   · Stock lenses can be edged to smaller diameters