Aspherical lens is lens, made by sphere surface(convex, concave) or curved surface, not flat.
It also has parabolic surface, hyperboloid, ellipsoid and polynomial.And, the nonaxisymmetric shapes such as donuts or rugby ball, are proposed. The biggest feature is that aspherical lens got rid of aberration, of which the problem in the past. For capturing intensity more, even though lens diameter is much bigger, this lens has no aberration. Thus, two or three spherical lens were necessary to be combined in the past.
We provide Aspherical lenses with huge a range of coating or substrate options. Anti-reflection coatings range from the Ultraviolet (UV) to the Infrared (IR) with variety of focal length.