话题
This article shows to what extent the focusing of a spherical lens can be improved by changing the input beam distribution using axicons.
Axicons are conical lenses which create a ring-shaped beam used in research or rather different laser applications. They can be either convex or concave and made from almost any optical material.
Beam expansion systems (also referred to as Beam Expander) are used for optimum adaption of beam cross sections between light sources (i.e. laser) and the following optical element.