Corrected Wavefront Transmission: 20X to 50X Improvement Over Large-Diameter Molded Glass Aspheric Lenses
Thorlabs stocks precision-ground, large-diameter aspheric lens from Asphericon. The aspheric lens is manufactured using CNC grinding and polishing machines; for diameters in excess of 15 mm this produces lenses with RMS wavefront errors that are typically 20 to 50 times less than a similarly sized molded aspheric lens. The lens is constructed using S-LAH64 or N-BK7 optical glass. Ohara's S-LAH64 optical glass is a low-dispersion glass with high index of refraction in order to minimize chromatic aberration.