An axicon lens, also known as a rotationally symmetric prism, is a lens that features one conical surface and one plano surface with a different apex angle. They are commonly used to create a beam with a Bessel intensity profile or a conical, non-diverging beam. When converting a collimated beam into a ring, the plano side of the axicon should face the collimated source. These axicons are precisely manufactured from high-quality UV Fused Silica, making them ideally suited for high-power laser applications.

An axicon deflects light according to Snell's Law, which can be used to find the deflection angle:

where n is the index of refraction of the glass, α is the physical angle of the prism, and ß is the angle the deflected beam creates with the optical axis. Here, the refractive index of air is assumed to be 1.