High-index planoconvex laser lenses Lenses in high-index glass (n=1.785) have only 55% of the spherical aberration of equivalent BK7 lenses, and can be very efficiently AR coated with single-layer coating. Beam expanders etc. can therefore be made with diffraction-limited performance and very high transmittance, and suitable for high powers, having no cemented interfaces.
Knight Optical > Lenses > High-index planoconvex laser lenses AR coated This is the section containing AR coated. 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 Knight Optical > Lenses > High-index planoconvex laser lenses
Specification Biconvex lenses.    Material: BK7 (or B270), SF11 for lower spherical aberrations (See spherical aberration calculation section)  Material Data: (see materials section)  Diameter: +0.0 / -0.10mm    Centring Accuracy: < 0.05mm (F.L 25mm) < 1.5mrad (F.L > 25mm)  Focal Length: (@ 587nm) ± 0.2mm ( 10mm) ± 2.0% (> 10mm)  Figure (sphericity): λ/4  Surface Quality: <40-20 scratch/dig (see quality section)	Click for Surface Reflectance Graph
Specific requirements We can manufacture High-index Planoconvex Laser 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 High-index planoconvex laser lenses Planoconvex lenses are coated on both faces with (***ASK**** ROB**) (see coatings section) Options available   · Mounting (all items)   · Stock lenses can be edged to smaller diameters See also SF11 concave lenses: High-index planoconcave laser lenses