Aspheric lenses - Precision grade Aspheric surfaces allow single elements to achieve near-diffraction-limited performance even at large apertures, avoiding the complexity, bulk and reflection losses of multiple-element designs such as microscope objectives. However, until recently it has not been possible to produce them economically with good figure. New precision moulding technology, and bulk demand for laser-diode collimators, now allows us to offer this range at a very reasonable cost. They are also ideal for laser focusing and beam expanders and for fibre input and output. Although designed for specific laser wavelengths, their performance will be practically as good over most of the visible and NIR range. The glass lenses have a single-layer AR coating on high index flint glass giving over 97% transmittance at the design wavelength. To calculate variation with wavelength. The plastic lenses offer high precision at a very low cost. Some items have integral mounting rings to simplify handing and mounting.
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Specification   Material: FDS-9 (nd=1.847, vd=23.8) TaC-4 (nd=1.734, vd=51.1) Acrylic Material Data: (see materials section)
Specific requirements We can source Precision Aspheric Lenses to most sizes 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 Precision Aspheric Lenses are coated on both faces with (single-layer antireflective coating giving over 97% transmission at design wavelength(see coatings section) Options available   · Mounting (all items)   · Stock lenses can be edged to smaller diameters