Parabolic mirrors, Hyperbolic mirrors, Ellipsoidal mirrors are most common used asperical parts.
From an application point of view, the aspheric surface can be divided into 3 types:
- An axisymmetric aspheric surface
- Two symmetry planes Aspheric surface
- Free-form surface which having no symmetry.
In principle, aspheric surfaces can take a wide variety of forms, is usually divided into:
- Secondary aspherical surface and
- High-order aspherical surface.
-- Secondary aspheric surfaces are the most widely used in optical instruments and optical deformed image systems.
-- High-order aspheric surfaces can be divided into monotonic meridional curves surfaces and non-monotonic surfaces.
Advantages-
Compared to a simple lens, Asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism, to achieve better image quality and improve optical system indentification capability.
A single aspheric lens can often replace a much more complex multi-lens system. The resulting device is smaller and lighter, and sometimes cheaper than the multi-lens design.
As so many advantages, Aspherical optics are widely used in military and residential optoelectronic field, satellite IR telescopes, television cameras, fiber optic communication, medical equipment, ect.
For more information about Aspheric lens, welcome to contact LPO!
Reference:
1-https://en.wikipedia.org/wiki/Aspheric_lens
